ip6mr: Add sizeof verification to MRT6_ASSERT and MT6_PIM

Verify the length of the user-space arguments. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Nov 26, 2012 · 03f52a0 · 03f52a0
1 parent c91f6df
commit 03f52a0
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
@@ -1646,6 +1646,9 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 	case MRT6_ASSERT:
 	{
 		int v;
+
+		if (optlen != sizeof(v))
+			return -EINVAL;
 		if (get_user(v, (int __user *)optval))
 			return -EFAULT;
 		mrt->mroute_do_assert = v;
@@ -1656,6 +1659,9 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
 	case MRT6_PIM:
 	{
 		int v;
+
+		if (optlen != sizeof(v))
+			return -EINVAL;
 		if (get_user(v, (int __user *)optval))
 			return -EFAULT;
 		v = !!v;