1 files changed, 10 insertions, 4 deletions

diff --git a/src/lib/libcrypto/ec/ec_pmeth.c b/src/lib/libcrypto/ec/ec_pmeth.c
index 16fc07642a..d422765b00 100644
--- a/src/lib/libcrypto/ec/ec_pmeth.c
+++ b/src/lib/libcrypto/ec/ec_pmeth.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_pmeth.c,v 1.21 2023/12/28 22:12:37 tb Exp $ */
+/* $OpenBSD: ec_pmeth.c,v 1.22 2024/08/26 22:01:28 op Exp $ */
 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2006.
  */
@@ -57,6 +57,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include <openssl/asn1t.h>
@@ -445,10 +446,15 @@ pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value)
                 }
                 return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
         } else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
-                int co_mode;
-                co_mode = atoi(value);
-                return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
+                int cofactor_mode;
+                const char *errstr;
+
+                cofactor_mode = strtonum(value, -1, 1, &errstr);
+                if (errstr != NULL)
+                        return -2;
+                return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, cofactor_mode);
         }
+
         return -2;
 }