diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2ca7d7f..08897a3 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1923,6 +1923,9 @@
 	int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
 	struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
 
+	if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
+		return -EINVAL;
+
 	while (len >= sizeof(struct sadb_x_ipsecrequest)) {
 		if ((err = parse_ipsecrequest(xp, rq)) < 0)
 			return err;