fix some bugs with memory usage

crypto/heimdal/lib/asn1/gen_free.c

@@ -61,6 +61,13 @@ free_type (const char *name, const Type *t, int preserve)
     case TNull:
     case TGeneralizedTime:
     case TUTCTime:
+        /*
+         * This doesn't do much, but it leaves zeros where garbage might
+         * otherwise have been found.  Gets us closer to having the equivalent
+         * of a memset()-to-zero data structure after calling the free
+         * functions.
+         */
+        fprintf(codefile, "*%s = 0;\n", name);
 	break;
     case TBitString:
 	if (ASN1_TAILQ_EMPTY(t->members))

crypto/heimdal/lib/asn1/gen_template.c

@@ -858,6 +858,7 @@ generate_template(const Symbol *s)
 	    "int\n"
 	    "decode_%s(const unsigned char *p, size_t len, %s *data, size_t *size)\n"
 	    "{\n"
+            "    memset(data, 0, sizeof(*data));\n"
 	    "    return _asn1_decode_top(asn1_%s, 0|%s, p, len, data, size);\n"
 	    "}\n"
 	    "\n",