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ipv6: fix useless rol32 call on hash

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[ 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@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Ian King 2018-07-17 17:12:39 +01:00 committed by Greg Kroah-Hartman
parent 0348dcd98a
commit a5d33d38bd
1 changed files with 1 additions and 1 deletions
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2
include/net/ipv6.h
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@ -795,7 +795,7 @@ static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
* 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;