Btrfs: fix memory leak in start_transaction()

This patch fixes memory leak of the transaction handle which happened
when starting transaction failed on a freezed fs.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 910ff8051ba9..35489644c247 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -351,8 +351,10 @@ again:
          */
         if (type != TRANS_JOIN_NOLOCK &&
             !__sb_start_write(root->fs_info->sb, SB_FREEZE_FS, false)) {
-                if (type == TRANS_JOIN_FREEZE)
+                if (type == TRANS_JOIN_FREEZE) {
+                        kmem_cache_free(btrfs_trans_handle_cachep, h);
                         return ERR_PTR(-EPERM);
+                }
                 sb_start_intwrite(root->fs_info->sb);
         }