linux-kernel - Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Write in gfs2_qd

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Date: Tue,  2 Apr 2024 10:15:40 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+956651316bb16496a837@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Write in gfs2_qd_dealloc (2)

please test uaf in gfs2_qd_dealloc

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 18737353cca0

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 572d58e86296..91103e0307ac 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -1321,6 +1321,8 @@ static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
 fail_delete_wq:
 	destroy_workqueue(sdp->sd_delete_wq);
 fail_free:
+	wait_event(sdp->sd_kill_wait,
+                atomic_read(&sdp->sd_quota_count) == 0);
 	free_sbd(sdp);
 	sb->s_fs_info = NULL;
 	return error;