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udp: fix secpath leak 

After commit dce4551cb2 ("udp: preserve head state for IP_CMSG_PASSSEC")
we preserve the secpath for the whole skb lifecycle, but we also
end up leaking a reference to it.

We must clear the head state on skb reception, if secpath is
present.

Fixes: dce4551cb2 ("udp: preserve head state for IP_CMSG_PASSSEC")
Signed-off-by: Yossi Kuperman <yossiku@mellanox.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Yossi Kuperman 2017-09-01 14:42:30 +02:00 committed by David S. Miller
parent 79e99bdd60
commit e8a732d1bc
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/udp.c
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@ -1176,7 +1176,7 @@ static void udp_set_dev_scratch(struct sk_buff *skb)
scratch->csum_unnecessary = !!skb_csum_unnecessary(skb);
scratch->is_linear = !skb_is_nonlinear(skb);
#endif
if (likely(!skb->_skb_refdst))
if (likely(!skb->_skb_refdst && !skb_sec_path(skb)))
scratch->_tsize_state |= UDP_SKB_IS_STATELESS;
}