netdev - Re: [PATCH net v2 2/3] net/packet: fix overflow in check for tp_frame

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 29 Mar 2017 08:51:08 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Craig Gallek <cgallek@...gle.com>, netdev@...r.kernel.org,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>
Subject: Re: [PATCH net v2 2/3] net/packet: fix overflow in check for
 tp_frame_nr

On Wed, 2017-03-29 at 16:11 +0200, Andrey Konovalov wrote:
> When calculating rb->frames_per_block * req->tp_block_nr the result
> can overflow.
> 
> Add a check that tp_block_size * tp_block_nr <= UINT_MAX.
> 
> Since frames_per_block <= tp_block_size, the expression would
> never overflow.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>