diff options
| -rw-r--r-- | net/ipv6/sit.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index 09e440e8dfae..07e21a82ce4c 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -778,8 +778,9 @@ static bool check_6rd(struct ip_tunnel *tunnel, const struct in6_addr *v6dst, pbw0 = tunnel->ip6rd.prefixlen >> 5; pbi0 = tunnel->ip6rd.prefixlen & 0x1f; - d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> - tunnel->ip6rd.relay_prefixlen; + d = tunnel->ip6rd.relay_prefixlen < 32 ? + (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >> + tunnel->ip6rd.relay_prefixlen : 0; pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen; if (pbi1 > 0) |