linux-kernel - Re: [syzbot] [pvrusb2?] KASAN: slab-use-after-free Read in pvr2_context_set

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Date: Fri, 16 Feb 2024 08:42:48 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+ce750e124675d4599449@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [pvrusb2?] KASAN: slab-use-after-free Read in pvr2_context_set_notify (2)

On Wed, 31 Jan 2024 02:22:39 -0800
> HEAD commit:    f1a27f081c1f usb: typec: qcom-pmic-typec: allow different ..
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1429ed40180000

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

--- x/drivers/media/usb/pvrusb2/pvrusb2-context.c
+++ y/drivers/media/usb/pvrusb2/pvrusb2-context.c
@@ -267,9 +267,9 @@ static void pvr2_context_exit(struct pvr
 void pvr2_context_disconnect(struct pvr2_context *mp)
 {
 	pvr2_hdw_disconnect(mp->hdw);
-	mp->disconnect_flag = !0;
 	if (!pvr2_context_shutok())
 		pvr2_context_notify(mp);
+	pvr2_context_destroy(mp);
 }
 
 
--