linux-kernel - [PATCH 4.17 37/63] ipv6: fix useless rol32 call on hash

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Date:   Mon, 23 Jul 2018 14:24:43 +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, Colin Ian King <colin.king@...onical.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.17 37/63] ipv6: fix useless rol32 call on hash

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

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

From: Colin Ian King <colin.king@...onical.com>

[ Upstream commit 169dc027fb02492ea37a0575db6a658cf922b854 ]

The rol32 call is currently rotating hash but the rol'd value is
being discarded. I believe the current code is incorrect and hash
should be assigned the rotated value returned from rol32.

Thanks to David Lebrun for spotting this.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/ipv6.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -829,7 +829,7 @@ static inline __be32 ip6_make_flowlabel(
 	 * to minimize possbility that any useful information to an
 	 * attacker is leaked. Only lower 20 bits are relevant.
 	 */
-	rol32(hash, 16);
+	hash = rol32(hash, 16);
 
 	flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK;