https://bugs.kde.org/show_bug.cgi?id=451086
nia1048...@gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |nia1048...@gmail.com --- Comment #1 from nia1048...@gmail.com --- I can confirm this issue too. OS: Gentoo krfb version: 21.12.3 window system: wayland The problem lies in the screen size reported by VNC server to client. When a VNC client connects to a VNC server, the server needs to tell the client its desktop screen size. My screen size is 1920x1080, but krfb reported 65535x65535 back to client, causing the malloc error. In fact, the width and height variable are not being set during the initialization, they both remain value -1. The width and height are 16bit long in VNC protocol, so krfb reported 65535x65535. Use the following patch to output the width and height variable. diff --git a/krfb/rfbservermanager.cpp b/krfb/rfbservermanager.cpp index 0878f86..484b6e8 100644 --- a/krfb/rfbservermanager.cpp +++ b/krfb/rfbservermanager.cpp @@ -205,6 +205,7 @@ rfbScreenInfoPtr RfbServerManager::newScreen() //qDebug() << "bpp: " << bpp; rfbLogEnable(KRFB().isDebugEnabled()); + qCDebug(KRFB) << "width: " << w << ", height: " << h; screen = rfbGetScreen(nullptr, nullptr, w, h, 8, 3, bpp); screen->paddedWidthInBytes = d->fb->paddedWidth(); The krfb's output: $ env LANG=C QT_LOGGING_RULES='krfb.*=true' krfb QSocketNotifier: Can only be used with threads started with QThread krfb.krfb: found plugin at "/usr/lib64/qt5/plugins/krfb/framebuffer/krfb_framebuffer_xcb.so" krfb.krfb: Loaded plugin with name "xcb" krfb.krfb: found plugin at "/usr/lib64/qt5/plugins/krfb/framebuffer/krfb_framebuffer_qt.so" krfb.krfb: Loaded plugin with name "qt" krfb.krfb: found plugin at "/usr/lib64/qt5/plugins/krfb/framebuffer/krfb_framebuffer_pw.so" krfb.krfb: Loaded plugin with name "pw" krfb.krfb: Using FrameBuffer: "pw" krfb.framebuffer.pipewire: Egl initialization succeeded krfb.framebuffer.pipewire: "EGL version: 1.4" Initializing D-Bus connectivity with XDG Desktop Portal DBus session created: "/org/freedesktop/portal/desktop/request/1_150/krfb2361472498" krfb.krfb: width: -1 , height: -1 09/05/2022 18:09:10 WARNING: Width (-1) is not a multiple of 4. VncViewer has problems with that. krfb.krfb: Starting server. Listen port: 5900 Listen Address: "0.0.0.0" Password enabled: true 09/05/2022 18:09:10 Unable to establish connection with systemd socket 09/05/2022 18:09:10 Listening for VNC connections on TCP port 5900 09/05/2022 18:09:10 Listening for VNC connections on TCP6 port 5900 ^C -- You are receiving this mail because: You are watching all bug changes.