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

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Message-Id: <20150111.215427.2061918421162909520.davem@davemloft.net>
Date:	Sun, 11 Jan 2015 21:54:27 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	cj@...ux.com
Cc:	willemb@...gle.com, edumazet@...gle.com, dborkman@...hat.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

From: Christoph Jaeger <cj@...ux.com>
Date: Sun, 11 Jan 2015 13:01:16 -0500

> 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>

Applied, thank you.
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