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icmp: Don't leak original dst into ip_route_input()

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ip_route_input() unconditionally overwrites the dst. Hide the original
dst attached to the skb by calling skb_dst_set(skb, NULL) prior to
ip_route_input().

Reported-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2015-07-21 10:43:55 +02:00 committed by David S. Miller
parent 1d8fff9073
commit 773a69d64b
1 changed files with 1 additions and 0 deletions
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net/ipv4/icmp.c
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@ -496,6 +496,7 @@ static struct rtable *icmp_route_lookup(struct net *net,
} }
/* Ugh! */ /* Ugh! */
orefdst = skb_in->_skb_refdst; /* save old refdst */ orefdst = skb_in->_skb_refdst; /* save old refdst */
skb_dst_set(skb_in, NULL);
err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr, err = ip_route_input(skb_in, fl4_dec.daddr, fl4_dec.saddr,
RT_TOS(tos), rt2->dst.dev); RT_TOS(tos), rt2->dst.dev);