linux-kernel - Re: [PATCH] packet: tpacket_snd(): fix signed/unsigned comparison

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Message-ID: <55B76256.2040105@iogearbox.net>
Date:	Tue, 28 Jul 2015 13:07:02 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Alexander Drozdov <al.drozdov@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>
CC:	Eric Dumazet <edumazet@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Eyal Birger <eyal.birger@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] packet: tpacket_snd(): fix signed/unsigned comparison

On 07/28/2015 12:57 PM, Alexander Drozdov wrote:
> tpacket_fill_skb() can return a negative value (-errno) which
> is stored in tp_len variable. In that case the following
> condition will be (but shouldn't be) true:
>
> tp_len > dev->mtu + dev->hard_header_len
>
> as dev->mtu and dev->hard_header_len are both unsigned.
>
> That may lead to just returning an incorrect EMSGSIZE errno
> to the user.
>
> Signed-off-by: Alexander Drozdov <al.drozdov@...il.com>

Looks good to me, thanks!

Acked-by: Daniel Borkmann <daniel@...earbox.net>
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