1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index da930fa089c9..aa3d07c52a8f 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -694,7 +694,7 @@ done:
                 retv = ip6_ra_control(sk, val, NULL);
                 break;
         case IPV6_MTU_DISCOVER:
-                if (val<0 || val>2)
+                if (val<0 || val>3)
                         goto e_inval;
                 np->pmtudisc = val;
                 retv = 0;