From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D7ADB572694; Mon, 31 Aug 2026 13:48:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788184129; cv=none; b=KycXlz/CId8C5s6NXSP0A4p5/ZT0xaKIkI5epab4SYpPIbbI8YxXs2SGXq8M0Q8KSvBLdsGQt6U/wPGWsmmRgnVyrtrCWaWQhzRU3uXBa+S8/bcMxy+rYixrj2LCejIbAEsMFNSeWLOwMu3fmZtGH2L+gKVXfxoKAoVPK8F6VAg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788184129; c=relaxed/simple; bh=RaElDS+c/Q1wberwx68yo5vr9ORd+SHgsytznX5uDwg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VkviWUs9WElCUwiKwB9gCTOJOubpbuz4K4YpwWPC+3uViblkzjeofYzy+xWRL0cRu/5E2Z1tJBA0NYT+uDATlJnBQ5MbpAfoxLR8PkOaTLtiJ8fCSbWBKBugxv27hIMxi2H1sbNu+usqSIdqvxsv+OaZd46MQpeo6NztRhb6qqc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OFXvjmVh; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="OFXvjmVh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36C131F00A3E; Mon, 31 Aug 2026 13:48:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788184127; bh=eRircS0tnNE7f9HWTAwHC2VEFU5tSPv5CXl4k0UUexs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OFXvjmVhPcLn5k/fnODhBgOevyTKwQ0BpddWFpvxJyl9/sH1x8RygKz0UaL7FJ/jH Dhmf7qGRM5mkf7zTr8UBnlzyBSfMURxVLnK1k0reWlM5i6m/wX8NX4fRzIJ/vz/X8k a8KGr7cGPqKvYKWs1zC0OCxRIZMu1asJmVZRrZWI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+7e1e5911f9eac50bedc7@syzkaller.appspotmail.com, Aleksandr Nogikh , syzbot@syzkaller.appspotmail.com Subject: [PATCH 6.18 38/83] usb: usbtest: disable dynamic ID support Date: Mon, 31 Aug 2026 15:34:14 +0200 Message-ID: <20260831133401.437896429@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260831133359.207714926@linuxfoundation.org> References: <20260831133359.207714926@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Aleksandr Nogikh commit 00e2071f6d5621a5ddea311a5e6b143ae6e474af upstream. The usbtest driver relies on the driver_info field of struct usb_device_id to point to a valid struct usbtest_info descriptor. This structure contains essential test configurations, such as endpoint addresses and test modes, which are required during probe. When a user dynamically adds a new device ID via the sysfs new_id interface without specifying a reference device, the USB core initializes driver_info to 0 (NULL). When a matching device is subsequently probed, usbtest_probe() unconditionally casts driver_info to a struct usbtest_info pointer and dereferences it, leading to a NULL pointer dereference crash: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] RIP: 0010:usbtest_probe+0x3b9/0x1280 drivers/usb/misc/usbtest.c:2822 Because usbtest strictly requires pre-defined usbtest_info descriptors to function, dynamic ID binding via sysfs is fundamentally unsupported for this driver. Fix this by setting .no_dynamic_id = 1 on usbtest_driver. This instructs the USB core to skip creating the new_id and remove_id sysfs interfaces for usbtest, preventing invalid dynamic ID entries from being created. Cc: stable@vger.kernel.org Reported-by: syzbot+7e1e5911f9eac50bedc7@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=7e1e5911f9eac50bedc7 Signed-off-by: Aleksandr Nogikh Tested-by: syzbot@syzkaller.appspotmail.com Link: https://patch.msgid.link/20260806152651.2370795-1-nogikh@google.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/usbtest.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/usb/misc/usbtest.c +++ b/drivers/usb/misc/usbtest.c @@ -3054,6 +3054,7 @@ static struct usb_driver usbtest_driver .disconnect = usbtest_disconnect, .suspend = usbtest_suspend, .resume = usbtest_resume, + .no_dynamic_id = 1, }; /*-------------------------------------------------------------------------*/