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authorEric Sandeen <sandeen@redhat.com>2014-06-12 09:39:58 +0400
committerChris Mason <clm@fb.com>2014-06-13 20:52:28 +0400
commit3e2426bd0eb980648449e7a2f5a23e3cd3c7725c (patch)
tree4e08fc2ba5d9d174882ca9ad40f43327e701db4c
parentd737278091fccda77f6896012ba86c5ffb57993f (diff)
downloadlinux-3e2426bd0eb980648449e7a2f5a23e3cd3c7725c.tar.xz
btrfs: fix use of uninit "ret" in end_extent_writepage()
If this condition in end_extent_writepage() is false: if (tree->ops && tree->ops->writepage_end_io_hook) we will then test an uninitialized "ret" at: ret = ret < 0 ? ret : -EIO; The test for ret is for the case where ->writepage_end_io_hook failed, and we'd choose that ret as the error; but if there is no ->writepage_end_io_hook, nothing sets ret. Initializing ret to 0 should be sufficient; if writepage_end_io_hook wasn't set, (!uptodate) means non-zero err was passed in, so we choose -EIO in that case. Signed-of-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Chris Mason <clm@fb.com>
-rw-r--r--fs/btrfs/extent_io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 930f23dfaa2b..23398ad430a0 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2354,7 +2354,7 @@ int end_extent_writepage(struct page *page, int err, u64 start, u64 end)
{
int uptodate = (err == 0);
struct extent_io_tree *tree;
- int ret;
+ int ret = 0;
tree = &BTRFS_I(page->mapping->host)->io_tree;