embed support for CHOICE type

Reviewed-by: NRich Salz <rsalz@openssl.org>

crypto/asn1/tasn_fre.c

@@ -125,8 +125,10 @@ static void asn1_item_embed_free(ASN1_VALUE **pval, const ASN1_ITEM *it,
         }
         if (asn1_cb)
             asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL);
-        OPENSSL_free(*pval);
-        *pval = NULL;
+        if (embed == 0) {
+            OPENSSL_free(*pval);
+            *pval = NULL;
+        }
         break;
 
     case ASN1_ITYPE_EXTERN:

crypto/asn1/tasn_new.c

@@ -142,9 +142,13 @@ int asn1_item_embed_new(ASN1_VALUE **pval, const ASN1_ITEM *it, int embed)
                 return 1;
             }
         }
-        *pval = OPENSSL_zalloc(it->size);
-        if (!*pval)
-            goto memerr;
+        if (embed) {
+            memset(*pval, 0, it->size);
+        } else {
+            *pval = OPENSSL_zalloc(it->size);
+            if (!*pval)
+                goto memerr;
+        }
         asn1_set_choice_selector(pval, -1, it);
         if (asn1_cb && !asn1_cb(ASN1_OP_NEW_POST, pval, it, NULL))
             goto auxerr;