The hardware checksumming flags need to be cleared when forwarding packets.
Bridging just needs to forward what ever checksum is in the existing skbuff,
it doesn't want or need the packet to be resummed.

Without this fix, forwarding between smart/dumb interfaces causes an oops.

diff -Nru a/net/bridge/br_forward.c b/net/bridge/br_forward.c

--- a/net/bridge/br_forward.c	Mon Sep  8 09:29:44 2003
+++ b/net/bridge/br_forward.c	Mon Sep  8 09:29:44 2003

@@ -59,6 +59,7 @@
 
 	indev = skb->dev;
 	skb->dev = to->dev;
+	skb->ip_summed = CHECKSUM_NONE;
 
 	NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
 			__br_forward_finish);