Btrfs: fix missing check before disabling quota

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / qgroup.c

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index a0d6368249fa3b07f903d445194bccc5f0def879..88ab785bbd73181e64843d97838799619e1c140e 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -847,6 +847,10 @@ int btrfs_quota_disable(struct btrfs_trans_handle *trans,
        int ret = 0;
 
        spin_lock(&fs_info->qgroup_lock);
+       if (!fs_info->quota_root) {
+               spin_unlock(&fs_info->qgroup_lock);
+               return 0;
+       }
        fs_info->quota_enabled = 0;
        fs_info->pending_quota_state = 0;
        quota_root = fs_info->quota_root;