btrfs: checking NULL or not in some functions

Because NULL is returned when the memory allocation fails,
it is checked whether it is NULL.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 42dfc3077040..6d66e5caff97 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2751,7 +2751,13 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
         log = root->log_root;
 
         path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
         dst_path = btrfs_alloc_path();
+        if (!dst_path) {
+                btrfs_free_path(path);
+                return -ENOMEM;
+        }
 
         min_key.objectid = inode->i_ino;
         min_key.type = BTRFS_INODE_ITEM_KEY;