netdev - [PATCH net-next] xfrm6: Fix a offset value for network header in _decode

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Message-ID: <m2d25phhox.wl@sfc.wide.ad.jp>
Date:	Wed, 04 Feb 2015 23:31:10 +0900
From:	Hajime Tazaki <tazaki@....wide.ad.jp>
To:	netdev@...r.kernel.org
Cc:	steffen.klassert@...unet.com, herbert@...dor.apana.org.au
Subject: [PATCH net-next] xfrm6: Fix a offset value for network header in _decode_session6


When a network-layer header has multiple IPv6 extension headers, then offset
for mobility header goes wrong. This regression breaks an xfrm policy lookup
for a particular receive packet. Binding update packets of Mobile IPv6
are all discarded without this fix.

Fixes: de3b7a06dfe1 ("xfrm6: Fix transport header offset in _decode_session6.")
Signed-off-by: Hajime Tazaki <tazaki@....wide.ad.jp>
---
 net/ipv6/xfrm6_policy.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 48bf5a0..8d2d01b 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -200,6 +200,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
 
 #if IS_ENABLED(CONFIG_IPV6_MIP6)
 		case IPPROTO_MH:
+			offset += ipv6_optlen(exthdr);
 			if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
 				struct ip6_mh *mh;
 
-- 
2.1.0

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