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

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Message-ID: <tencent_6C9ECE2079B26EC02F4D6CC095D8EA56ED0A@qq.com>
Date: Sun, 14 Apr 2024 17:37:40 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+d0f14b2d5a3d1587fbe7@...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)

please test uaf in pvr2_context_set_notify

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-context.c b/drivers/media/usb/pvrusb2/pvrusb2-context.c
index 1764674de98b..e93bca93ce4c 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-context.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-context.c
@@ -267,9 +267,9 @@ static void pvr2_context_exit(struct pvr2_context *mp)
 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);
+	mp->disconnect_flag = !0;
 }