linux-kernel - Re: [syzbot] WARNING in hid_submit_ctrl/usb_submit

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Date:   Thu, 19 Aug 2021 11:26:26 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     syzbot <syzbot+9b57a46bf1801ce2a2ca@...kaller.appspotmail.com>
Cc:     benjamin.tissoires@...hat.com, jikos@...nel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, mkubecek@...e.cz,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in hid_submit_ctrl/usb_submit_urb

On Wed, Aug 18, 2021 at 01:13:06PM -0700, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch but the reproducer is still triggering an issue:
> WARNING in hid_submit_ctrl/usb_submit_urb
> 
> ------------[ cut here ]------------
> usb 1-1: BOGUS control dir, pipe 80000280 doesn't match bRequestType a1
> WARNING: CPU: 1 PID: 10180 at drivers/usb/core/urb.c:410 usb_submit_urb+0x149d/0x18a0 drivers/usb/core/urb.c:410

Looks like I was wrong.  Let's see what's really happening.

Alan Stern

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 794c7931a242

--- usb-devel.orig/drivers/hid/usbhid/hid-core.c
+++ usb-devel/drivers/hid/usbhid/hid-core.c
@@ -397,6 +397,8 @@ static int hid_submit_ctrl(struct hid_de
 		} else
 			padlen = 0;
 		usbhid->urbctrl->transfer_buffer_length = padlen;
+		hid_err(hid, "submit_ctrl: maxpacket %d len %d padlen %d\n",
+				maxpacket, len, padlen);
 	}
 	usbhid->urbctrl->dev = hid_to_usb_dev(hid);