btrfs: don't BUG_ON allocation errors in btrfs_drop_snapshot

In addition to properly handling allocation failure from btrfs_alloc_path, I
also fixed up the kzalloc error handling code immediately below it.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index f6af4236e59b..6bce721e7bbc 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6272,10 +6272,14 @@ int btrfs_drop_snapshot(struct btrfs_root *root,
         int level;
 
         path = btrfs_alloc_path();
-        BUG_ON(!path);
+        if (!path)
+                return -ENOMEM;
 
         wc = kzalloc(sizeof(*wc), GFP_NOFS);
-        BUG_ON(!wc);
+        if (!wc) {
+                btrfs_free_path(path);
+                return -ENOMEM;
+        }
 
         trans = btrfs_start_transaction(tree_root, 0);
         BUG_ON(IS_ERR(trans));