ws2_32: Manage shorter length for SO_RCVBUF.

dlls/ws2_32/socket.c

@@ -1609,6 +1609,12 @@ int WINAPI getsockopt( SOCKET s, int level, int optname, char *optval, int *optl
         }
 
         case SO_RCVBUF:
+            if (*optlen < sizeof(DWORD) || !optval)
+            {
+                if (optval) memset( optval, 0, *optlen );
+                SetLastError( WSAEFAULT );
+                return SOCKET_ERROR;
+            }
             return server_getsockopt( s, IOCTL_AFD_WINE_GET_SO_RCVBUF, optval, optlen );
 
         case SO_RCVTIMEO:
@@ -2863,6 +2869,7 @@ int WINAPI setsockopt( SOCKET s, int level, int optname, const char *optval, int
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_SO_OOBINLINE, (char *)&value, sizeof(value) );
 
         case SO_RCVBUF:
+            if (optlen < 0) optlen = 4;
             return server_setsockopt( s, IOCTL_AFD_WINE_SET_SO_RCVBUF, optval, optlen );
 
         case SO_RCVTIMEO:

dlls/ws2_32/tests/sock.c

@@ -1173,6 +1173,7 @@ static void test_set_getsockopt(void)
         {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_DONTLINGER, TRUE, {1, 1, 4}, {0, 0xdead0001, 0}, TRUE, TRUE},
         {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_LINGER, FALSE, {1, 2, 4}, {0xdeadbe00, 0xdead0000}, TRUE},
         {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_OOBINLINE, TRUE, {1, 1, 4}, {0, 0xdead0001, 0}, TRUE, TRUE},
+        {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_RCVBUF, FALSE, {1, 2, 4}, {0xdeadbe00, 0xdead0000}, TRUE},
         {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_KEEPALIVE, TRUE, {1, 1, 1}, {0}, TRUE},
         {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_DONTROUTE, TRUE, {1, 1, 1}, {0}, TRUE},
         {AF_INET, SOCK_STREAM, SOL_SOCKET, SO_RCVTIMEO, FALSE, {1, 2, 4}, {0}, TRUE},