GH769: Reuse strndup()

Reviewed-by: NMatt Caswell <matt@openssl.org>
Signed-off-by: NRich Salz <rsalz@akamai.com>

crypto/x509v3/v3_alt.c

@@ -577,11 +577,9 @@ static int do_othername(GENERAL_NAME *gen, char *value, X509V3_CTX *ctx)
     if ((gen->d.otherName->value = ASN1_generate_v3(p + 1, ctx)) == NULL)
         return 0;
     objlen = p - value;
-    objtmp = OPENSSL_malloc(objlen + 1);
+    objtmp = OPENSSL_strndup(value, objlen);
     if (objtmp == NULL)
         return 0;
-    strncpy(objtmp, value, objlen);
-    objtmp[objlen] = 0;
     gen->d.otherName->type_id = OBJ_txt2obj(objtmp, 0);
     OPENSSL_free(objtmp);
     if (!gen->d.otherName->type_id)

crypto/x509v3/v3_info.c

@@ -177,13 +177,11 @@ static AUTHORITY_INFO_ACCESS *v2i_AUTHORITY_INFO_ACCESS(X509V3_EXT_METHOD
         ctmp.value = cnf->value;
         if (!v2i_GENERAL_NAME_ex(acc->location, method, ctx, &ctmp, 0))
             goto err;
-        if ((objtmp = OPENSSL_malloc(objlen + 1)) == NULL) {
+        if ((objtmp = OPENSSL_strndup(cnf->name, objlen)) == NULL) {
             X509V3err(X509V3_F_V2I_AUTHORITY_INFO_ACCESS,
                       ERR_R_MALLOC_FAILURE);
             goto err;
         }
-        strncpy(objtmp, cnf->name, objlen);
-        objtmp[objlen] = 0;
         acc->method = OBJ_txt2obj(objtmp, 0);
         if (!acc->method) {
             X509V3err(X509V3_F_V2I_AUTHORITY_INFO_ACCESS,