linux-kernel - Re: usb/core: slab-out-of-bounds read in cdc_parse_cdc

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Message-ID: <20170921073154.GA11294@kroah.com>
Date:   Thu, 21 Sep 2017 09:31:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Jaejoong Kim <climbbb.kim@...il.com>,
        USB list <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: usb/core: slab-out-of-bounds read in cdc_parse_cdc_header

On Wed, Sep 20, 2017 at 04:45:08PM +0200, Andrey Konovalov wrote:
> Hi!
> 
> I've got the following crash while fuzzing the kernel with syzkaller.
> 
> On commit ebb2c2437d8008d46796902ff390653822af6cc4 (Sep 18).
> 
> It looks like cdc_parse_cdc_header() doesn't validate buflen before
> accessing buffer[1], buffer[2] and so on. The only check present is
> while (buflen > 0).

Ugh, you are right, let me go work on a patch, thanks for the report...