linux-kernel - [PATCH 4.5 035/101] net/mlx4_en: Fix endianness bug in IPV6 csum calculation

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Message-Id: <20160517011507.666308461@linuxfoundation.org>
Date:	Mon, 16 May 2016 18:20:40 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Daniel Jurgens <danielj@...lanox.com>,
	Carol Soto <clsoto@...ibm.com>,
	Tariq Toukan <tariqt@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.5 035/101] net/mlx4_en: Fix endianness bug in IPV6 csum calculation

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

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

From: Daniel Jurgens <danielj@...lanox.com>

[ Upstream commit 82d69203df634b4dfa765c94f60ce9482bcc44d6 ]

Use htons instead of unconditionally byte swapping nexthdr.  On a little
endian systems shifting the byte is correct behavior, but it results in
incorrect csums on big endian architectures.

Fixes: f8c6455bb04b ('net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE')
Signed-off-by: Daniel Jurgens <danielj@...lanox.com>
Reviewed-by: Carol Soto <clsoto@...ibm.com>
Tested-by: Carol Soto <clsoto@...ibm.com>
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx4/en_rx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -704,7 +704,7 @@ static int get_fixed_ipv6_csum(__wsum hw
 
 	if (ipv6h->nexthdr == IPPROTO_FRAGMENT || ipv6h->nexthdr == IPPROTO_HOPOPTS)
 		return -1;
-	hw_checksum = csum_add(hw_checksum, (__force __wsum)(ipv6h->nexthdr << 8));
+	hw_checksum = csum_add(hw_checksum, (__force __wsum)htons(ipv6h->nexthdr));
 
 	csum_pseudo_hdr = csum_partial(&ipv6h->saddr,
 				       sizeof(ipv6h->saddr) + sizeof(ipv6h->daddr), 0);