Re: [PATCH net] packet: bail out of packet_snd() if L2 header creation fails

From: Daniel Borkmann
Date: Sun Jan 11 2015 - 16:38:29 EST


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@xxxxxxxxx>

Thanks, Christoph!

Acked-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/