linux-kernel - Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in usbtmc

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Message-ID: <20250817020836.4788-1-hdanton@sina.com>
Date: Sun, 17 Aug 2025 10:08:35 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+abbfd103085885cf16a2@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in usbtmc_interrupt

> Date: Fri, 15 Aug 2025 20:07:34 -0700	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    931e46dcbc7e Add linux-next specific files for 20250814
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=11ef65a2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bb7fbecfa2364d1c
> dashboard link: https://syzkaller.appspot.com/bug?extid=abbfd103085885cf16a2
> compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a99842580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17108da2580000

#syz test

--- x/drivers/usb/class/usbtmc.c
+++ y/drivers/usb/class/usbtmc.c
@@ -2365,6 +2365,7 @@ static void usbtmc_free_int(struct usbtm
 	if (!data->iin_ep_present || !data->iin_urb)
 		return;
 	usb_kill_urb(data->iin_urb);
+	usb_kill_urb(data->iin_urb);
 	kfree(data->iin_buffer);
 	data->iin_buffer = NULL;
 	usb_free_urb(data->iin_urb);
--