From a004b06237ee297a971edd2d95cc1c061a9802b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bodo=20M=C3=B6ller?= <bodo@openssl.org>
Date: Thu, 6 Feb 2003 18:07:23 +0000
Subject: [PATCH] additional sanity checks for arguments to EC_POINTs_mul()

---
 crypto/ec/ec_mult.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/crypto/ec/ec_mult.c b/crypto/ec/ec_mult.c
index 603ba31b81..4dbc931120 100644
--- a/crypto/ec/ec_mult.c
+++ b/crypto/ec/ec_mult.c
@@ -209,6 +209,17 @@ int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 	EC_POINT ***val_sub = NULL; /* pointers to sub-arrays of 'val' */
 	int ret = 0;
 	
+	if (group->meth != r->meth)
+		{
+		ECerr(EC_F_EC_POINTS_MUL, EC_R_INCOMPATIBLE_OBJECTS);
+		return 0;
+		}
+
+	if ((scalar == NULL) && (num == 0))
+		{
+		return EC_POINT_set_to_infinity(group, r);
+		}
+
 	if (scalar != NULL)
 		{
 		generator = EC_GROUP_get0_generator(group);