btrfs: Don't pass NULL ptr to func that may deref it.

Commit Message

Jesper Juhl Dec. 25, 2010, 9:22 p.m. UTC

None

Patch

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 9ac1715..99599f1 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -105,6 +105,8 @@  noinline void btrfs_clear_path_blocking(struct btrfs_path *p,
 /* this also releases the path */
 void btrfs_free_path(struct btrfs_path *p)
 {
+	if (!p)
+		return;
 	btrfs_release_path(NULL, p);
 	kmem_cache_free(btrfs_path_cachep, p);
 }