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authorEric Sandeen <sandeen@redhat.com>2014-06-12 00:39:58 -0500
committerJiri Slaby <jslaby@suse.cz>2014-07-02 12:06:41 +0200
commit591cb1f862018995e04a596b9bb0c469016c1c99 (patch)
tree72ce17e47a997d0467dc6c86f845041cc1f8e8ba
parentf383013c585b3ef91f1f19f0c9d2e60071e5fb01 (diff)
btrfs: fix use of uninit "ret" in end_extent_writepage()
commit 3e2426bd0eb980648449e7a2f5a23e3cd3c7725c upstream. 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> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
-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 a3dd2806d651..b395791dd923 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2312,7 +2312,7 @@ 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;