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

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Message-ID: <CAAeHK+wPALJHKsqK2+faw5t2A1xYjd1qUmedhg=P+m48w4JBag@mail.gmail.com>
Date:   Thu, 21 Sep 2017 19:16:22 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Alan Stern <stern@...land.harvard.edu>
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, Sep 21, 2017 at 6:50 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> 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?

I did, see the previous email (replying in case you missed it).

>
> Alan Stern
>