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IP_GRE: Fix kernel panic in IP_GRE with GRE csum. 

Due to IP_GRE 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.

Bug introduced in commit 6b78f16e4b (gre: add GSO support)

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-01-23 11:45:42 +00:00 committed by David S. Miller
parent 9839ff0dea
commit 5465740ace
1 changed files with 5 additions and 1 deletions
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6
net/ipv4/ip_gre.c
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@ -963,8 +963,12 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
ptr--;
}
if (tunnel->parms.o_flags&GRE_CSUM) {
int offset = skb_transport_offset(skb);
*ptr = 0;
*(__sum16 *)ptr = ip_compute_csum((void *)(iph+1), skb->len - sizeof(struct iphdr));
*(__sum16 *)ptr = csum_fold(skb_checksum(skb, offset,
skb->len - offset,
0));
}
}