From: Julian Anastasov <ja@ssi.bg>
Date: Sun, 7 Aug 2011 10:17:22 +0000 (+0000)
Subject: ipv4: use dst with ref during bcast/mcast loopback
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d52fbfc9e5c7bb0b0dbc256edf17dee170ce839d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ipv4: use dst with ref during bcast/mcast loopback

Make sure skb dst has reference when moving to
another context. Currently, I don't see protocols that can
hit it when sending broadcasts/multicasts to loopback using
noref dsts, so it is just a precaution.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 77d3eded665a..8c6563361ab5 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -122,6 +122,7 @@ static int ip_dev_loopback_xmit(struct sk_buff *newskb)
 	newskb->pkt_type = PACKET_LOOPBACK;
 	newskb->ip_summed = CHECKSUM_UNNECESSARY;
 	WARN_ON(!skb_dst(newskb));
+	skb_dst_force(newskb);
 	netif_rx_ni(newskb);
 	return 0;
 }