From: Denis V. Lunev <den@openvz.org>
Date: Wed, 1 Oct 2008 09:13:16 +0000 (-0700)
Subject: ipv6: NULL pointer dereferrence in tcp_v6_send_ack
X-Git-Tag: v2.6.27-rc9~49^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2a5b82751f73a0bf6f604ce56d34adba6da1b246;p=pandora-kernel.git

ipv6: NULL pointer dereferrence in tcp_v6_send_ack

The following actions are possible:
tcp_v6_rcv
  skb->dev = NULL;
  tcp_v6_do_rcv
    tcp_v6_hnd_req
      tcp_check_req
        req->rsk_ops->send_ack == tcp_v6_send_ack

So, skb->dev can be NULL in tcp_v6_send_ack. We must obtain namespace
from dst entry.

Thanks to Vitaliy Gusev <vgusev@openvz.org> for initial problem finding
in IPv4 code.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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