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authorTrond Myklebust <Trond.Myklebust@netapp.com>2006-09-08 09:48:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-08 10:22:51 -0700
commite9f7bee1df223dcf83743b46cb06c08d95497ec0 (patch)
tree67beae4733ef0286645112a52623c81c8f8a19a9 /include
parent016eb4a0ed06a3677d67a584da901f0e9a63c666 (diff)
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[PATCH] NFS: large non-page-aligned direct I/O clobbers memory
The logic in nfs_direct_read_schedule and nfs_direct_write_schedule can allow data->npages to be one larger than rpages. This causes a page pointer to be written beyond the end of the pagevec in nfs_read_data (or nfs_write_data). Fix this by making nfs_(read|write)_alloc() calculate the size of the pagevec array, and initialise data->npages. Also get rid of the redundant argument to nfs_commit_alloc(). Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nfs_fs.h6
-rw-r--r--include/linux/nfs_xdr.h4
2 files changed, 5 insertions, 5 deletions
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 247434553ae..530b1e6173b 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -427,7 +427,7 @@ extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
extern void nfs_writedata_release(void *);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
-struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
+struct nfs_write_data *nfs_commit_alloc(void);
void nfs_commit_free(struct nfs_write_data *p);
#endif
@@ -478,7 +478,7 @@ static inline int nfs_wb_page(struct inode *inode, struct page* page)
/*
* Allocate nfs_write_data structures
*/
-extern struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount);
+extern struct nfs_write_data *nfs_writedata_alloc(size_t len);
/*
* linux/fs/nfs/read.c
@@ -492,7 +492,7 @@ extern void nfs_readdata_release(void *data);
/*
* Allocate nfs_read_data structures
*/
-extern struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount);
+extern struct nfs_read_data *nfs_readdata_alloc(size_t len);
/*
* linux/fs/nfs3proc.c
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index db9cbf68e12..41e5a19199e 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -729,7 +729,7 @@ struct nfs_read_data {
struct list_head pages; /* Coalesced read requests */
struct nfs_page *req; /* multi ops per nfs_page */
struct page **pagevec;
- unsigned int npages; /* active pages in pagevec */
+ unsigned int npages; /* Max length of pagevec */
struct nfs_readargs args;
struct nfs_readres res;
#ifdef CONFIG_NFS_V4
@@ -748,7 +748,7 @@ struct nfs_write_data {
struct list_head pages; /* Coalesced requests we wish to flush */
struct nfs_page *req; /* multi ops per nfs_page */
struct page **pagevec;
- unsigned int npages; /* active pages in pagevec */
+ unsigned int npages; /* Max length of pagevec */
struct nfs_writeargs args; /* argument struct */
struct nfs_writeres res; /* result struct */
#ifdef CONFIG_NFS_V4