kc3-lang/SDL/src/video/os2

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• Hash : bc9888c9
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  Date : 2021-06-12T14:55:24
  

  OS2_GetDisplayModes: malloc a new copy of mode's driver data. Based on a patch by Jochen Schäfer <josch1710@live.de> : The problem is, that in the initialization code uses the same structure for desktop_mode and current_mode. See SDL_os2video.c:OS2_VideoInit(): stSDLDisplay.desktop_mode = stSDLDisplayMode; stSDLDisplay.current_mode = stSDLDisplayMode; ... stSDLDisplayMode.driverdata = pDisplayData; Then, if you call GetDisplayModes, current_mode will added to the modes list, with the same driverdata pointer to desktop_mode. SDL_AddDisplayMode( display, &display->current_mode ); When VideoQuit gets called, first the modes list gets freed including the driverdata, the desktop_mode gets freed. See SDL_video.c:SDL_VideoQuit(): for (j = display->num_display_modes; j--;) { SDL_free(display->display_modes[j].driverdata); display->display_modes[j].driverdata = NULL; } SDL_free(display->display_modes); display->display_modes = NULL; SDL_free(display->desktop_mode.driverdata); display->desktop_mode.driverdata = NULL; So, the display_modes[j].driverdata gets freed, but desktop_mode->driverdata points to the same memory, but is not NULL'ed. When desktop_mode->driverdata gets freed the memory is already freed, and libcx crashes the application on SDL_Quit.

• Files

• SDL_gradd.h
• SDL_os2dive.c
• SDL_os2messagebox.c
• SDL_os2messagebox.h
• SDL_os2mouse.c
• SDL_os2mouse.h
• SDL_os2output.h
• SDL_os2util.c
• SDL_os2util.h
• SDL_os2video.c
• SDL_os2video.h
• SDL_os2vman.c

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