4.17-stable review patch. If anyone has any objections, please let me know.
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From: Colin Ian King colin.king@canonical.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@canonical.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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;