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>

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 910ff8051ba93c99b6f655baf354e2e091a2913c..35489644c24783c925fd870f4fcb8bd80f36c285 100644 (file)
--- 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);
        }