gre: Fix MTU calculation for bound GRE tunnels

The GRE header length should be subtracted when the tunnel MTU is calculated. This just corrects for the associativity change introduced by commit 42aa916265d740d66ac1f17290366e9494c884c2.

---
 net/ipv4/ip_gre.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index cb4a0f4..82c11dd 100644
@@ -951,7 +951,7 @@ static int ipgre_tunnel_bind_dev(struct net_device *dev)
 			addend += 4;
 	}
 	dev->needed_headroom = addend + hlen;
-	mtu -= dev->hard_header_len - addend;
+	mtu -= dev->hard_header_len + addend;
 
 	if (mtu < 68)
 		mtu = 68;

1.6.0.6

From: Tom Goff <[email protected]>
Date: Fri, 14 Aug 2009 11:37:58 -0700

Thanks for finding and fixing this bug, applied.