linux-kernel - Re: [PATCH] usb: usbfs: fix crash in check_ctrlrecip()->usb_find_alt

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Date:   Tue, 25 Sep 2018 10:55:54 -0400 (EDT)
From:   Vladis Dronov <vdronov@...hat.com>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oliver Neukum <oneukum@...e.com>,
        Hans de Goede <hdegoede@...hat.com>,
        syzkaller@...glegroups.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>
Subject: Re: [PATCH] usb: usbfs: fix crash in
 check_ctrlrecip()->usb_find_alt_setting()

> What reason is there for having two different fixes for the same bug?
> This one isn't going to get into any mainline trees that don't already
> have c9a4cb204e9e.

I believe this is the right thing to do, so usb_find_alt_setting()
is not called with a known-bad argument.

Honestly, I would change "if (!config)" in usb_find_alt_setting() to
"BUG_ON(!config)" so we know when its callers do smth wrong and go
fix callers. Unfortunately, I understand this hardly will be accepted.

Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security Engineer