linux-kernel - Re: [syzbot] [PATCH] test 305230142ae0

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Message-ID: <0000000000004968590609c6662f@google.com>
Date:   Thu, 09 Nov 2023 22:26:24 -0800
From:   syzbot <syzbot+4d81015bc10889fd12ea@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] test 305230142ae0

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

#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..bae6c54e4f87 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3806,6 +3806,10 @@ static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg)
 	}
 
 	if (sa->create) {
+		if (sa->qgroupid == BTRFS_FIRST_FREE_OBJECTID) {
+			ret = -EINVAL;
+			goto out;
+		}
 		ret = btrfs_create_qgroup(trans, sa->qgroupid);
 	} else {
 		ret = btrfs_remove_qgroup(trans, sa->qgroupid);