Re: [PATCH net] net: flow_dissector: fail on evil iph->ihl

From: Eric Dumazet
Date: Fri Nov 01 2013 - 05:48:30 EST

On Fri, 2013-11-01 at 15:01 +0800, Jason Wang wrote:
> We don't validate iph->ihl which may lead a dead loop if we meet a IPIP
> skb whose iph->ihl is zero. Fix this by failing immediately when iph->ihl
> is evil (less than 5).
> This issue were introduced by commit ec5efe7946280d1e84603389a1030ccec0a767ae
> (rps: support IPIP encapsulation).
> Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
> Cc: Petr Matousek <pmatouse@xxxxxxxxxx>
> Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
> Cc: Daniel Borkmann <dborkman@xxxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
> ---
> This patch is needed for stable.
> ---

Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>

Thanks Jason !

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at