netdev - [PATCH v2] IP_GRE: Fix kernel panic in IP

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Date:	Tue, 22 Jan 2013 14:56:38 -0800
From:	Pravin B Shelar <pshelar@...ira.com>
To:	netdev@...r.kernel.org
Cc:	jesse@...ira.com, Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH v2] IP_GRE: Fix kernel panic in IP_GRE with GRE csum.

Fixed code indentation according to comments from David Miller.

--8<--------------------------cut here-------------------------->8--
Due to GSO support, GRE can recieve non linear skb which
results in panic in case of GRE_CSUM.
Following patch fixes it by using correct csum API.

Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
 net/ipv4/ip_gre.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 303012a..8179e066 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -964,7 +964,10 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
 		}
 		if (tunnel->parms.o_flags&GRE_CSUM) {
 			*ptr = 0;
-			*(__sum16 *)ptr = ip_compute_csum((void *)(iph+1), skb->len - sizeof(struct iphdr));
+			*(__sum16 *)ptr = csum_fold(skb_checksum(skb,
+						    skb_transport_offset(skb),
+						    skb->len - skb_transport_offset(skb),
+						    0));
 		}
 	}
 
-- 
1.7.10

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