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2015-11-11qcow2: avoid misaligned 64bit bswapJohn Snow1-4/+7
If we create a buffer directly on the stack by using 12 bytes, there's no guarantee the 64bit value we want to swap will be aligned, which could cause errors with undefined behavior. Spotted with clang -fsanitize=undefined and observed in iotests 15, 26, 44, 115 and 121. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-10-16block: Convert bs->file to BdrvChildKevin Wolf1-21/+24
This patch removes the temporary duplication between bs->file and bs->file_child by converting everything to BdrvChild. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Fam Zheng <famz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-09-14qcow2: Make qcow2_alloc_bytes() more explicitMax Reitz1-0/+6
In case of -EAGAIN returned by update_refcount(), we should discard the cluster offset we were trying to allocate and request a new one, because in theory that old offset might now be taken by a refcount block. In practice, this was not the case due to update_refcount() generally returning strictly monotonic increasing cluster offsets. However, this behavior is not set in stone, and it is also not obvious when looking at qcow2_alloc_bytes() alone, so we should not rely on it. Reported-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-09-14qcow2: Make size_to_clusters() return uint64_tMax Reitz1-4/+8
Sadly, some images may have more clusters than what can be represented using a plain int. We should be prepared for that case (in qcow2_check_refcounts() we actually were trying to catch that case, but since size_to_clusters() truncated the returned value, that check never did anything useful). Cc: qemu-stable <qemu-stable@nongnu.org> Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-09-14qcow2: Rename BDRVQcowState to BDRVQcow2StateKevin Wolf1-29/+29
BDRVQcowState is already used by qcow1, and gdb is always confused which one to use. Rename the qcow2 one so they can be distinguished. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com>
2015-09-11maint: remove / fix many doubled wordsDaniel P. Berrange1-1/+1
Many source files have doubled words (eg "the the", "to to", and so on). Most of these can simply be removed, but a couple were actual mis-spellings (eg "to to" instead of "to do"). There was even one triple word score "to to to" :-) Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2015-07-02qcow2: Handle EAGAIN returned from update_refcountJindřich Makovička1-10/+12
Fixes a crash during image compression Signed-off-by: Jindřich Makovička <makovick@gmail.com> Tested-by: Richard W.M. Jones <rjones@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-05-22qcow2: make qcow2_cache_put() a void functionAlberto Garcia1-24/+5
This function never receives an invalid table pointer, so we can make it void and remove all the error checking code. Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-05-22qcow2: use one single memory block for the L2/refcount cache tablesAlberto Garcia1-3/+5
The qcow2 L2/refcount cache contains one separate table for each cache entry. Doing one allocation per table adds unnecessary overhead and it also requires us to store the address of each table separately. Since the size of the cache is constant during its lifetime, it's better to have an array that contains all the tables using one single allocation. In my tests measuring freshly created caches with sizes 128MB (L2) and 32MB (refcount) this uses around 10MB of RAM less. Signed-off-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-05-22qcow2: Flush pending discards before allocating clusterKevin Wolf1-0/+5
Before a freed cluster can be reused, pending discards for this cluster must be processed. The original assumption was that this was not a problem because discards are only cached during discard/write zeroes operations, which are synchronous so that no concurrent write requests can cause cluster allocations. However, the discard/write zeroes operation itself can allocate a new L2 table (and it has to in order to put zero flags there), so make sure we can cope with the situation. This fixes https://bugs.launchpad.net/bugs/1349972. Cc: qemu-stable@nongnu.org Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
2015-04-28Convert (ffs(val) - 1) to ctz32(val)Stefan Hajnoczi1-1/+1
This commit was generated mechanically by coccinelle from the following semantic patch: @@ expression val; @@ - (ffs(val) - 1) + ctz32(val) The call sites have been audited to ensure the ffs(0) - 1 == -1 case never occurs (due to input validation, asserts, etc). Therefore we don't need to worry about the fact that ctz32(0) == 32. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1427124571-28598-5-git-send-email-stefanha@redhat.com Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-16qcow2: Respect new_block in alloc_refcount_block()Max Reitz1-2/+14
When choosing a new place for the refcount table, alloc_refcount_block() tries to infer the number of clusters used so far from its argument cluster_index (which comes from the idea that if any cluster with an index greater than cluster_index was in use, the refcount table would have to be big enough already to describe cluster_index). However, there is a cluster that may be at or after cluster_index, and which is not covered by the refcount structures, and that is the new refcount block new_block. Therefore, it should be taken into account for the blocks_used calculation. Also, because new_block already describes (or is intended to describe) cluster_index, we may not put the new refcount structures there. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 1423598552-24301-2-git-send-email-mreitz@redhat.com Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
2015-03-10qcow2: More helpers for refcount modificationMax Reitz1-2/+119
Add helper functions for getting and setting refcounts in a refcount array for any possible refcount order, and choose the correct one during refcount initialization. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Helper function for refcount modificationMax Reitz1-53/+73
Since refcounts do not always have to be a uint16_t, all refcount blocks and arrays in memory should not have a specific type (thus they become pointers to void) and for accessing them, two helper functions are used (a getter and a setter). Those functions are called indirectly through function pointers in the BDRVQcowState so they may later be exchanged for different refcount orders. With the check and repair functions using this function, the refcount array they are creating will be in big endian byte order; additionally, using realloc_refcount_array() makes the size of this refcount array always cluster-aligned. Both combined allow rebuild_refcount_structure() to drop the bounce buffer which was used to convert parts of the refcount array to big endian byte order and store them on disk. Instead, those parts can now be written directly. [ kwolf: Fixed a build failure on 32 bit and another with old glib ] Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Helper for refcount array reallocationMax Reitz1-49/+81
Add a helper function for reallocating a refcount array, independent of the refcount order. The newly allocated space is zeroed and the function handles failed reallocations gracefully. The helper function will always align the buffer size to a cluster boundary; if storing the refcounts in such an array in big endian byte order, this makes it possible to write parts of the array directly as refcount blocks into the image file. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Use 64 bits for refcount valuesMax Reitz1-21/+19
Refcounts may have a width of up to 64 bits, so qemu should use the same width to represent refcount values internally. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Use unsigned addend for update_refcount()Max Reitz1-22/+43
update_refcount() and qcow2_update_cluster_refcount() currently take a signed addend. At least one caller passes a value directly derived from an absolute refcount that should be reached ("l2_refcount - 1" in expand_zero_clusters_in_l1()). Therefore, the addend should be unsigned as well; this will be especially important for 64 bit refcounts. Because update_refcount() then no longer knows whether the refcount should be increased or decreased, it now requires an additional flag which specified exactly that. The same applies to qcow2_update_cluster_refcount(). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Only return status from qcow2_get_refcountMax Reitz1-39/+47
Refcounts can theoretically be of type uint64_t; in order to be able to represent the full range, qcow2_get_refcount() cannot use a single variable to represent both all refcount values and also keep some values reserved for errors. One solution would be to add an Error pointer parameter to qcow2_get_refcount(); however, no caller could (currently) pass that error message, so it would have to be emitted immediately and be passed to the next caller by returning -EIO or something similar. Therefore, an Error parameter does not offer any advantages here. The solution applied by this patch is simpler to use. Because no caller would be able to pass the error message, they would have to print it and free it, whereas with this patch the caller only needs to pass the returned integer (which is often a no-op from the code perspective, because that integer will be stored in a variable "ret" which will be returned by the fail path of many callers). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Do not return new value after refcount updateMax Reitz1-10/+15
qcow2_update_cluster_refcount() does not have any quick access to the new refcount value, it has to call qcow2_get_refcount(). Some callers do not need that new value at all, others call qcow2_get_refcount() themselves anyway (albeit in a different code path, which can however be easily changed), therefore there is no advantage in making qcow2_update_cluster_refcount() return the new value. Drop it. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-03-10qcow2: Add two new fields to BDRVQcowStateMax Reitz1-2/+2
Add two new fields regarding refcount information (the bit width of every entry and the maximum refcount value) to the BDRVQcowState. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2015-02-06qcow2: Rewrite qcow2_alloc_bytes()Max Reitz1-39/+39
qcow2_alloc_bytes() is a function with insufficient error handling and an unnecessary goto. This patch rewrites it. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-11-03block/qcow2: Make get_refcount() globalMax Reitz1-13/+13
Reading the refcount of a cluster is an operation which can be useful in all of the qcow2 code, so make that function globally available. While touching this function, amend the comment describing the "addend" parameter: It is (no longer, if it ever was) necessary to have it set to -1 or 1; any value is fine. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net> Message-id: 1414404776-4919-6-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-10-23qcow2: Drop REFCOUNT_SHIFTMax Reitz1-18/+14
With BDRVQcowState.refcount_block_bits, we don't need REFCOUNT_SHIFT anymore. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Clean up after refcount rebuildMax Reitz1-0/+45
Because the old refcount structure will be leaked after having rebuilt it, we need to recalculate the refcounts and run a leak-fixing operation afterwards (if leaks should be fixed at all). Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Rebuild refcount structure during checkMax Reitz1-6/+305
The previous commit introduced the "rebuild" variable to qcow2's implementation of the image consistency check. Now make use of this by adding a function which creates a completely new refcount structure based solely on the in-memory information gathered before. The old refcount structure will be leaked, however. This leak will be dealt with in a follow-up commit. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Do not perform potentially damaging repairsMax Reitz1-161/+27
If a referenced cluster has a refcount of 0, increasing its refcount may result in clusters being allocated for the refcount structures. This may overwrite the referenced cluster, therefore we cannot simply increase the refcount then. In such cases, we can either try to replicate all the refcount operations solely for the check operation, basing the allocations on the in-memory refcount table; or we can simply rebuild the whole refcount structure based on the in-memory refcount table. Since the latter will be much easier, do that. To prepare for this, introduce a "rebuild" boolean which should be set to true whenever a fix is rather dangerous or too complicated using the current refcount structures. Another example for this is refcount blocks being referenced more than once. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Fix refcount blocks beyond image endMax Reitz1-4/+63
If the qcow2 check function detects a refcount block located beyond the image end, grow the image appropriately. This cannot break anything and is the logical fix for such a case. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Reuse refcount table in calculate_refcounts()Max Reitz1-5/+7
We will later call calculate_refcounts multiple times, so reuse the refcount table if possible. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Let inc_refcounts() resize the reftableMax Reitz1-22/+35
Now that the refcount table can be passed around by reference, do that for inc_refcounts() (and subsequently check_refcounts_l1() and check_refcounts_l2()) and use it for resizing it when a cluster after the image end is encountered. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Let inc_refcounts() return -errnoMax Reitz1-31/+60
As of a future patch, inc_refcounts() will have to throw errors which are generally signaled by returning -errno. Therefore, let it return an integer which is either 0 for success or -errno and handle the -errno case in all callers. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Split fail code in L1 and L2 checksMax Reitz1-9/+14
Instead of printing out an error message, incrementing check_errors and returning a fixed -errno, just do cleanups and return -ret, with ret set by the code which threw the exception (jumped to the fail label). Also, increment check_errors on error in check_refcounts_l2(). Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Use int64_t for in-memory reftable sizeMax Reitz1-3/+3
Use int64_t for the entry count of the in-memory refcount table throughout the check functions. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Pull check_refblocks() upMax Reitz1-53/+49
Pull check_refblocks() before calculate_refcounts() so we can drop its static declaration. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Use sizeof(**refcount_table)Max Reitz1-1/+1
When implementing variable refcounts, we want to be able to easily find all the places in qemu which are tied to a certain refcount order. Replace sizeof(uint16_t) in the check code by sizeof(**refcount_table) so we can later find it more easily. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-23qcow2: Split qcow2_check_refcounts()Max Reitz1-51/+102
Put the code for calculating the reference counts and comparing them during qemu-img check into own functions. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-10-20qcow2: fix leak of Qcow2DiscardRegion in update_refcount_discardZhang Haoyu1-0/+1
When the Qcow2DiscardRegion is adjacent to another one referenced by "d", free this Qcow2DiscardRegion metadata referenced by "p" after it was removed from s->discards queue. Signed-off-by: Zhang Haoyu <zhanghy@sangfor.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-09-22qcow2: Check L1/L2/reftable entries for alignmentMax Reitz1-2/+42
Offsets taken from the L1, L2 and refcount tables are generally assumed to be correctly aligned. However, this cannot be guaranteed if the image has been written to by something different than qemu, thus check all offsets taken from these tables for correct cluster alignment. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1409926039-29044-5-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22qcow2: Use qcow2_signal_corruption() for overlapsMax Reitz1-21/+3
Use the new function in case of a failed overlap check. This changes output in case of corruption, so adapt iotest 060's reference output accordingly. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Benoît Canet <benoit.canet@nodalink.com> Message-id: 1409926039-29044-4-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-09-22qapi/block: Add "fatal" to BLOCK_IMAGE_CORRUPTEDMax Reitz1-0/+1
Not every BLOCK_IMAGE_CORRUPTED event must be fatal; for example, when reading from an image, they should generally not be. Nonetheless, even an image only read from may of course be corrupted and this can be detected during normal operation. In this case, a non-fatal event should be emitted, but the image should not be marked corrupt (in accordance to "fatal" set to false). Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-id: 1409926039-29044-2-git-send-email-mreitz@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-20block: Use g_new() & friends where that makes obvious senseMarkus Armbruster1-4/+4
g_new(T, n) is neater than g_malloc(sizeof(T) * n). It's also safer, for two reasons. One, it catches multiplication overflowing size_t. Two, it returns T * rather than void *, which lets the compiler catch more type errors. Patch created with Coccinelle, with two manual changes on top: * Add const to bdrv_iterate_format() to keep the types straight * Convert the allocation in bdrv_drop_intermediate(), which Coccinelle inexplicably misses Coccinelle semantic patch: @@ type T; @@ -g_malloc(sizeof(T)) +g_new(T, 1) @@ type T; @@ -g_try_malloc(sizeof(T)) +g_try_new(T, 1) @@ type T; @@ -g_malloc0(sizeof(T)) +g_new0(T, 1) @@ type T; @@ -g_try_malloc0(sizeof(T)) +g_try_new0(T, 1) @@ type T; expression n; @@ -g_malloc(sizeof(T) * (n)) +g_new(T, n) @@ type T; expression n; @@ -g_try_malloc(sizeof(T) * (n)) +g_try_new(T, n) @@ type T; expression n; @@ -g_malloc0(sizeof(T) * (n)) +g_new0(T, n) @@ type T; expression n; @@ -g_try_malloc0(sizeof(T) * (n)) +g_try_new0(T, n) @@ type T; expression p, n; @@ -g_realloc(p, sizeof(T) * (n)) +g_renew(T, p, n) @@ type T; expression p, n; @@ -g_try_realloc(p, sizeof(T) * (n)) +g_try_renew(T, p, n) Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-08-15qcow2: fix new_blocks double-free in alloc_refcount_block()Stefan Hajnoczi1-0/+1
Commit de82815db1c89da058b7fb941dab137d6d9ab738 ("qcow2: Handle failure for potentially large allocations") introduced a double-free of new_blocks in the alloc_refcount_block() error path. The qemu-iotests qcow2 026 test case was failing because qemu-io segfaulted. Make sure new_blocks is NULL after we free it the first time. Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-08-15qcow2: Return useful error code in refcount_init()Max Reitz1-2/+4
If bdrv_pread() returns an error, it is very unlikely that it was ENOMEM. In this case, the return value should be passed along; as bdrv_pread() will always either return the number of bytes read or a negative value (the error code), the condition for checking whether bdrv_pread() failed can be simplified (and clarified) as well. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Benoit Canet <benoit@irqsave.net>
2014-08-15qcow2: Handle failure for potentially large allocationsKevin Wolf1-10/+38
Some code in the block layer makes potentially huge allocations. Failure is not completely unexpected there, so avoid aborting qemu and handle out-of-memory situations gracefully. This patch addresses the allocations in the qcow2 block driver. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-06-23qapi event: convert BLOCK_IMAGE_CORRUPTEDWenchao Xia1-6/+8
Signed-off-by: Wenchao Xia <wenchaoqemu@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-05-09qcow2: Fix alloc_clusters_noref() overflow detectionMax Reitz1-1/+3
If the very first allocation has a length of 0, the free_cluster_index is still 0 after the for loop, which means that subtracting one from it will underflow and signal an invalid range of clusters by returning -EFBIG. However, there is no such range, as its length is 0. Fix this by preventing underflows on free_cluster_index during the check. Signed-off-by: Max Reitz <mreitz@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-04-30qcow2: Catch bdrv_getlength() errorMax Reitz1-0/+5
The call to bdrv_getlength() from qcow2_check_refcounts() may result in an error. Check this and abort if necessary. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-04-30qcow2: Avoid overflow in alloc_clusters_noref()Max Reitz1-0/+7
alloc_clusters_noref() stores the cluster index in a uint64_t. However, offsets are often represented as int64_t (as for example the return value of alloc_clusters_noref() itself demonstrates). Therefore, we should make sure all offsets in the allocated range of clusters are representable using int64_t without overflows. Signed-off-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2014-04-01qcow2: Protect against some integer overflows in bdrv_checkKevin Wolf1-9/+9
Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-04-01qcow2: Fix types in qcow2_alloc_clusters and alloc_clusters_norefKevin Wolf1-5/+6
In order to avoid integer overflows. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2014-04-01qcow2: Check new refcount table size on growthKevin Wolf1-0/+4
If the size becomes larger than what qcow2_open() would accept, fail the growing operation. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 17:36:02 +0000