ws2_32: Forbid passing zero buffers to WSARecv().

dlls/ws2_32/socket.c

@@ -4035,6 +4035,12 @@ int WINAPI WSARecv(SOCKET s, LPWSABUF lpBuffers, DWORD dwBufferCount,
                    LPWSAOVERLAPPED lpOverlapped,
                    LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine)
 {
+    if (!dwBufferCount)
+    {
+        SetLastError( WSAEINVAL );
+        return -1;
+    }
+
     return WS2_recv_base(s, lpBuffers, dwBufferCount, NumberOfBytesReceived, lpFlags,
                        NULL, NULL, lpOverlapped, lpCompletionRoutine, NULL);
 }

dlls/ws2_32/tests/sock.c

@@ -12811,14 +12811,14 @@ static void test_empty_recv(void)
     WSASetLastError(0xdeadbeef);
     ret = WSARecv(client, NULL, 0, NULL, &flags, &overlapped, NULL);
     ok(ret == -1, "expected failure\n");
-    todo_wine ok(WSAGetLastError() == WSAEINVAL, "got error %u\n", WSAGetLastError());
+    ok(WSAGetLastError() == WSAEINVAL, "got error %u\n", WSAGetLastError());
 
     wsabuf.buf = buffer;
     wsabuf.len = 0;
     WSASetLastError(0xdeadbeef);
     ret = WSARecv(client, &wsabuf, 0, NULL, &flags, &overlapped, NULL);
     ok(ret == -1, "expected failure\n");
-    todo_wine ok(WSAGetLastError() == WSAEINVAL, "got error %u\n", WSAGetLastError());
+    ok(WSAGetLastError() == WSAEINVAL, "got error %u\n", WSAGetLastError());
 
     WSASetLastError(0xdeadbeef);
     ret = WSARecv(client, &wsabuf, 1, NULL, &flags, &overlapped, NULL);