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authorYoshinori Sano <yoshinori.sano@gmail.com>2011-02-15 12:01:42 +0000
committerroot <Chris Mason chris.mason@oracle.com>2011-03-28 05:37:49 -0400
commitdac97e516c617f9c797f64b0224050b70aea30c7 (patch)
treec5c7e7a40e649ee9beb9014b284d3a6e66fb94f2 /fs
parentc622ae6085d0c6ad834213bbf1477eb311359078 (diff)
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Btrfs: fix uncheck memory allocations
To make Btrfs code more robust, several return value checks where memory allocation can fail are introduced. I use BUG_ON where I don't know how to handle the error properly, which increases the number of using the notorious BUG_ON, though. Signed-off-by: Yoshinori Sano <yoshinori.sano@gmail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/compression.c6
-rw-r--r--fs/btrfs/extent-tree.c4
-rw-r--r--fs/btrfs/inode.c2
3 files changed, 12 insertions, 0 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 4d2110eafe2..992a4b92083 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -340,6 +340,8 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
WARN_ON(start & ((u64)PAGE_CACHE_SIZE - 1));
cb = kmalloc(compressed_bio_size(root, compressed_len), GFP_NOFS);
+ if (!cb)
+ return -ENOMEM;
atomic_set(&cb->pending_bios, 0);
cb->errors = 0;
cb->inode = inode;
@@ -354,6 +356,10 @@ int btrfs_submit_compressed_write(struct inode *inode, u64 start,
bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS);
+ if(!bio) {
+ kfree(cb);
+ return -ENOMEM;
+ }
bio->bi_private = cb;
bio->bi_end_io = end_compressed_bio_write;
atomic_inc(&cb->pending_bios);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 1efeda3b2f6..cd0b69f5737 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6978,6 +6978,10 @@ static noinline int get_new_locations(struct inode *reloc_inode,
struct disk_extent *old = exts;
max *= 2;
exts = kzalloc(sizeof(*exts) * max, GFP_NOFS);
+ if (!exts) {
+ ret = -ENOMEM;
+ goto out;
+ }
memcpy(exts, old, sizeof(*exts) * nr);
if (old != *extents)
kfree(old);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 67fd6e9552d..f739b256967 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -290,6 +290,7 @@ static noinline int add_async_extent(struct async_cow *cow,
struct async_extent *async_extent;
async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS);
+ BUG_ON(!async_extent);
async_extent->start = start;
async_extent->ram_size = ram_size;
async_extent->compressed_size = compressed_size;
@@ -388,6 +389,7 @@ again:
(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) {
WARN_ON(pages);
pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
+ BUG_ON(!pages);
if (BTRFS_I(inode)->force_compress)
compress_type = BTRFS_I(inode)->force_compress;