linux-kernel - Re: [syzbot] [net?] [virt?] [kvm?] KASAN: slab-use-after-free Read in vhost_task

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Message-ID: <tencent_546DA49414E876EEBECF2C78D26D242EE50A@qq.com>
Date: Tue, 30 Apr 2024 17:31:47 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+98edc2df894917b3431f@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] [virt?] [kvm?] KASAN: slab-use-after-free Read in vhost_task_fn

please test uaf in vhost_task_fn

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git bb7a2467e6be
diff --git a/kernel/vhost_task.c b/kernel/vhost_task.c
index 48c289947b99..8800f5acc007 100644
--- a/kernel/vhost_task.c
+++ b/kernel/vhost_task.c
@@ -61,8 +61,8 @@ static int vhost_task_fn(void *data)
 		set_bit(VHOST_TASK_FLAGS_KILLED, &vtsk->flags);
 		vtsk->handle_sigkill(vtsk->data);
 	}
-	complete(&vtsk->exited);
 	mutex_unlock(&vtsk->exit_mutex);
+	complete(&vtsk->exited);
 
 	do_exit(0);
 }