linux-kernel - Re: usb/storage/uas: slab-out-of-bounds in uas

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Message-ID: <Pine.LNX.4.44L0.1709211156570.1299-100000@iolanthe.rowland.org>
Date:   Thu, 21 Sep 2017 12:50:31 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Andrey Konovalov <andreyknvl@...gle.com>
cc:     Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        USB list <linux-usb@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>,
        <usb-storage@...ts.one-eyed-alien.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/storage/uas: slab-out-of-bounds in uas_probe

On Thu, 21 Sep 2017, Andrey Konovalov wrote:

> Hi!
> 
> I've got the following report while fuzzing the kernel with syzkaller.
> 
> On commit ebb2c2437d8008d46796902ff390653822af6cc4 (Sep 18).
> 
> The issue occurs when we iterate over interface altsettings, but I
> don't see the driver doing anything wrong. I might be missing
> something, or this might be an issue in USB core altsettings parsing.

My guess is the latter, although I can't see what is going wrong.  Can 
you provide the code that does this?

Alan Stern