Btrfs: handle kzalloc() failure in open_ctree()

Unwind and return -ENOMEM if the allocation fails here.

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

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index f3b287c22caf2e6855cf89bf780cf0b4b675c902..73895baf6e07383a628e2c912f33a6cb17a8c4f8 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1941,8 +1941,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
                     btrfs_level_size(tree_root,
                                      btrfs_super_log_root_level(disk_super));
 
-               log_tree_root = kzalloc(sizeof(struct btrfs_root),
-                                                     GFP_NOFS);
+               log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+               if (!log_tree_root) {
+                       err = -ENOMEM;
+                       goto fail_trans_kthread;
+               }
 
                __setup_root(nodesize, leafsize, sectorsize, stripesize,
                             log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);