commit df3b8836ed13e046bd2f05f16e7d02e9c21497ba
author Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Wed Sep 13 17:56:39 2017 -0600
committer Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Mon Sep 18 17:10:14 2017 -0600
tree 068524399360de07ab3f38ed02277ffccf099228
parent ef0a90a533331df85295d582a82a00f98fd9f89c

udpv6: Fix the checksum computation when HW checksum does not apply

While trying an ESP transport mode encryption for UDPv6 packets of
datagram size 1436 with MTU 1500, checksum error was observed in
the secondary fragment.

This error occurs due to the UDP payload checksum being missed out
when computing the full checksum for these packets in
udp6_hwcsum_outgoing().

CRs-Fixed: 2087660
Change-Id: I8f9066a5fa731a7c81b6713dc93b1cf4824646f0
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>

net/ipv6/udp.c

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index c925fd9..c43ef0c 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -915,6 +915,7 @@
 		 */
 		offset = skb_transport_offset(skb);
 		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+		csum = skb->csum;
 
 		skb->ip_summed = CHECKSUM_NONE;