ipv6: Check IPV6_MULTICAST_LOOP option value.

Only 0 and 1 are valid for IPV6_MULTICAST_LOOP socket option, and we should return an error of EINVAL otherwise, per RFC3493. Based on patch from Shan Wei <[email protected]>. Signed-off-by: YOSHIFUJI Hideaki <[email protected]>
pmladek · Jun 12, 2008 · 28d4488 · 28d4488
1 parent e8766fc
commit 28d4488
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
@@ -458,6 +458,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
 	case IPV6_MULTICAST_LOOP:
 		if (optlen < sizeof(int))
 			goto e_inval;
+		if (val != valbool)
+			goto e_inval;
 		np->mc_loop = valbool;
 		retv = 0;
 		break;