From: Dan Carpenter on
refs can be used with uninitialized data if btrfs_lookup_extent_info()
fails on the first pass through the loop. In the original code if that
happens then check_path_shared() probably returns 1, but with this patch
it will continue through the loop.

I'm not super familiar with this code so please look it over carefully.

Signed-off-by: Dan Carpenter <error27(a)>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fa6ccc1..9640dae 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2673,7 +2673,7 @@ static int check_path_shared(struct btrfs_root *root,
struct extent_buffer *eb;
int level;
int ret;
- u64 refs;
+ u64 refs = 0;

for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
if (!path->nodes[level])
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