libvncserver: Add thread protection for updateBuf

LibVNC / libvncserver

LibVNCServer/LibVNCClient are cross-platform C libraries that allow you to easily implement VNC server or client functionality in your program.

GNU General Public License v2.0

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libvncserver: Add thread protection for updateBuf #607

Open MichaelXie98 opened 4 months ago

MichaelXie98 commented 4 months ago

Thread safety for updateBuf in rfbSendFramebufferUpdate. In multi-thread mode, different threads may modify cl->updateBuf and cl->ublen at same time. When this happends libvncserver may crash.