Btrfs: uninitialized data is check_path_shared()

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, this patch
changes it to return 1 for safety.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d999c538cdc24a7c7bc60db7b2faadbaeb4719dd..f08427c70a785708c51aa61fcf83e5fce8b10f61 100644 (file)
--- 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 = 1;
 
        for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
                if (!path->nodes[level])