crypt32: Fail decoding a CRL entry if the serial number is empty.

dlls/crypt32/decode.c

@@ -1065,6 +1065,12 @@ static BOOL CRYPT_AsnDecodeCRLEntry(const BYTE *pbEncoded, DWORD cbEncoded,
     ret = CRYPT_AsnDecodeSequence(items, sizeof(items) / sizeof(items[0]),
      pbEncoded, cbEncoded, dwFlags, NULL, entry, pcbStructInfo, pcbDecoded,
      entry ? entry->SerialNumber.pbData : NULL);
+    if (ret && entry && !entry->SerialNumber.cbData)
+    {
+        WARN("empty CRL entry serial number\n");
+        SetLastError(CRYPT_E_ASN1_CORRUPT);
+        ret = FALSE;
+    }
     return ret;
 }
 

dlls/crypt32/tests/encode.c

@@ -4269,7 +4269,7 @@ static void test_decodeCRLToBeSigned(DWORD dwEncoding)
     ret = CryptDecodeObjectEx(dwEncoding, X509_CERT_CRL_TO_BE_SIGNED,
      v1CRLWithIssuerAndEmptyEntry, v1CRLWithIssuerAndEmptyEntry[1] + 2,
      CRYPT_DECODE_ALLOC_FLAG, NULL, (BYTE *)&buf, &size);
-    todo_wine ok(!ret && GetLastError() == CRYPT_E_ASN1_CORRUPT,
+    ok(!ret && GetLastError() == CRYPT_E_ASN1_CORRUPT,
      "Expected CRYPT_E_ASN1_CORRUPT, got %08x\n", GetLastError());
     /* with a real CRL entry */
     ret = CryptDecodeObjectEx(dwEncoding, X509_CERT_CRL_TO_BE_SIGNED,