btrfs: avoid NULL deref in btrfs_reserve_extent with DEBUG_ENOSPC

__find_space_info can return NULL but we don't check it before calling dump_space_info(). Signed-off-by: Jeff Mahoney <jeffm@suse.com>
git-mirror · Mar 22, 2012 · 5380428 · 5380428
1 parent d5c13f9
commit 5380428
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
@@ -5838,7 +5838,8 @@ int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
 			printk(KERN_ERR "btrfs allocation failed flags %llu, "
 			       "wanted %llu\n", (unsigned long long)data,
 			       (unsigned long long)num_bytes);
-			dump_space_info(sinfo, num_bytes, 1);
+			if (sinfo)
+				dump_space_info(sinfo, num_bytes, 1);
 		}
 	}