linux-kernel - Re: WARNING in usbhid_raw_request/usb_submit

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Message-ID: <Pine.LNX.4.44L0.2001071624021.1567-100000@iolanthe.rowland.org>
Date:   Tue, 7 Jan 2020 16:25:06 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     syzbot <syzbot+10e5f68920f13587ab12@...kaller.appspotmail.com>
cc:     andreyknvl@...gle.com, <gregkh@...uxfoundation.org>,
        <gustavo@...eddedor.com>, <ingrassia@...genesys.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <syzkaller-bugs@...glegroups.com>
Subject: Re: WARNING in usbhid_raw_request/usb_submit_urb (2)

On Tue, 7 Jan 2020, syzbot wrote:

> Hello,
> 
> syzbot has tested the proposed patch but the reproducer still triggered  
> crash:
> WARNING in usbhid_raw_request/usb_submit_urb

All right, now for a slightly larger change.

Alan Stern

#syz test: https://github.com/google/kasan.git ecdf2214

Index: usb-devel/drivers/usb/core/urb.c
===================================================================
--- usb-devel.orig/drivers/usb/core/urb.c
+++ usb-devel/drivers/usb/core/urb.c
@@ -205,7 +205,7 @@ int usb_urb_ep_type_check(const struct u
 
 	ep = usb_pipe_endpoint(urb->dev, urb->pipe);
 	if (!ep)
-		return -EINVAL;
+		return -EBADF;
 	if (usb_pipetype(urb->pipe) != pipetypes[usb_endpoint_type(&ep->desc)])
 		return -EINVAL;
 	return 0;