From 91b2a3f9bb0fa8d64b365a10b0624b0341e1a338 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?YOSHIFUJI=20Hideaki=20/=20=E5=90=89=E8=97=A4=E8=8B=B1?= =?UTF-8?q?=E6=98=8E?= Date: Sun, 11 Oct 2009 03:45:13 +0000 Subject: [PATCH] ipv6 sit: Set relay to 0.0.0.0 directly if relay_prefixlen == 0. ipv6 sit: Set relay to 0.0.0.0 directly if relay_prefixlen == 0. Do not use bit-shift if relay_prefixlen == 0; relay_prefix << 32 does not result in 0. Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- net/ipv6/sit.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index 193d0c6c5ce2..510d31f3cb96 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1014,9 +1014,12 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) ip6rd.prefixlen); if (!ipv6_addr_equal(&prefix, &ip6rd.prefix)) goto done; - relay_prefix = ip6rd.relay_prefix & - htonl(0xffffffffUL << - (32 - ip6rd.relay_prefixlen)); + if (ip6rd.relay_prefixlen) + relay_prefix = ip6rd.relay_prefix & + htonl(0xffffffffUL << + (32 - ip6rd.relay_prefixlen)); + else + relay_prefix = 0; if (relay_prefix != ip6rd.relay_prefix) goto done;