icmp: Don't leak original dst into ip_route_input()
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>
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index f5203fb..c0556f1 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -496,6 +496,7 @@
}
/* Ugh! */
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,
RT_TOS(tos), rt2->dst.dev);