linux-kernel - [PATCH 4.4 06/46] udpv6: Fix the checksum computation when HW checksum does not apply

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20171019134845.752581363@linuxfoundation.org>
Date:   Thu, 19 Oct 2017 15:48:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 06/46] udpv6: Fix the checksum computation when HW checksum does not apply

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>


[ Upstream commit 63ecc3d9436f8012e49dc846d6cb0a85a3433517 ]

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().

Fixes: d39d938c8228 ("ipv6: Introduce udpv6_send_skb()")
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/udp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1007,6 +1007,7 @@ static void udp6_hwcsum_outgoing(struct
 		 */
 		offset = skb_transport_offset(skb);
 		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+		csum = skb->csum;
 
 		skb->ip_summed = CHECKSUM_NONE;