udp: do not expect udp headers in recv cmsg IP_CMSG_CHECKSUM

[cascardo/linux.git] / net / ipv4 / ip_sockglue.c

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 89b5f3b..279471c 100644 (file)
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -106,7 +106,8 @@ static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
                return;
 
        if (offset != 0)
-               csum = csum_sub(csum, csum_partial(skb->data, offset, 0));
+               csum = csum_sub(csum, csum_partial(skb_transport_header(skb),
+                                                  offset, 0));
 
        put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
 }