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

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Message-ID: <1438083484.20182.43.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 28 Jul 2015 13:38:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Daniel Borkmann <daniel@...earbox.net>
Cc:	Alexander Drozdov <al.drozdov@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	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 Tue, 2015-07-28 at 13:07 +0200, Daniel Borkmann wrote:
> 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>
> --

Fixes: 52f1454f629fa ("packet: allow to transmit +4 byte in TX_RING slot for VLAN case")


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