Btrfs: Add check for null block group to find_search_start

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 6a7a9ba75fd9..39be6baccc36 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -204,6 +204,7 @@ new_group:
 wrapped:
         cache = btrfs_lookup_block_group(root->fs_info, last);
         if (!cache) {
+no_cache:
                 if (!wrapped) {
                         wrapped = 1;
                         last = search_start;
@@ -219,6 +220,8 @@ wrapped:
         }
         if (!full_scan)
                 cache = btrfs_find_block_group(root, cache, last, data, 0);
+        if (!cache)
+                goto no_cache;
         *cache_ret = cache;
         cache_miss = 0;
         goto again;