linux-kernel - Re: [PATCH net] packet: bail out of packet

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Message-ID: <54B2ED45.7070001@redhat.com>
Date:	Sun, 11 Jan 2015 22:38:13 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Christoph Jaeger <cj@...ux.com>
CC:	davem@...emloft.net, willemb@...gle.com, edumazet@...gle.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] packet: bail out of packet_snd() if L2 header creation
 fails

On 01/11/2015 07:01 PM, Christoph Jaeger wrote:
> Due to a misplaced parenthesis, the expression
>
>    (unlikely(offset) < 0),
>
> which expands to
>
>    (__builtin_expect(!!(offset), 0) < 0),
>
> never evaluates to true. Therefore, when sending packets with
> PF_PACKET/SOCK_DGRAM, packet_snd() does not abort as intended
> if the creation of the layer 2 header fails.
>
> Spotted by Coverity - CID 1259975 ("Operands don't affect result").
>
> Fixes: 9c7077622dd9 ("packet: make packet_snd fail on len smaller than l2 header")
> Signed-off-by: Christoph Jaeger <cj@...ux.com>

Thanks, Christoph!

Acked-by: Daniel Borkmann <dborkman@...hat.com>
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