Re: [syzbot] [PATCH] test 305230142ae0

[syzbot]

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Subject: [PATCH] test 305230142ae0
Author: lizhi.xu@xxxxxxxxxxxxx

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 305230142ae0

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 752acff2c734..21cf7a7f18ab 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3799,6 +3799,11 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
 		goto out;
 	}
 
+	if (sa->create && sa->qgroupid == BTRFS_FIRST_FREE_OBJECTID) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	trans = btrfs_join_transaction(root);
 	if (IS_ERR(trans)) {
 		ret = PTR_ERR(trans);