Zebediah Figura (@zfigura) commented about dlls/ws2_32/tests/sock.c:
server = accept(listener, NULL, NULL);ok(server != INVALID_SOCKET, "Could not accept TCP socket connection: %lu\n",GetLastError());ret = ioctlsocket(client, FIONBIO, &zero);ok(!ret, "Could not set TCP socket to blocking: %lun", GetLastError());- }
 - // Fill the address with invalid data
 - for (int i = 0; i < sizeof(bad_addr); i++)
 ((char *)&bad_addr)[i] = sizeof(bad_addr) - i;- memcpy(&bad_addr_copy, &bad_addr, sizeof(bad_addr_copy));
 - ret = sendto(server, serverMsg, sizeof(serverMsg), 0, (SOCKADDR *)&bad_addr, sizeof(bad_addr));
 - ok(ret == sizeof(serverMsg), "Incorrect return value from sendto: %d (%d)\n", ret, WSAGetLastError());
 - ret = recvfrom(client, clientBuf, sizeof(clientBuf), 0, (SOCKADDR *)&bad_addr, &to_len);
 - ok(!memcmp(&bad_addr, &bad_addr_copy, sizeof(bad_addr)), "Provided address modified by recvfrom\n");
 
Can you please also check to_len here?