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x11: Don't unload libGL.so to prevent a crash in XCloseDisplay()

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libGL.so may register callbacks that can be invoked upon XCloseDisplay().
If XCloseDisplay() is called after libGL.so is unloaded, the callback pointer
will point at freed memory and invoking it will crash.

The texture framebuffer check optimized out in f37e4a9 was causing libGL.so to
never be unloaded as a side-effect. Skipping it exposed this bug by allowing
libGL.so to actually unload.
This commit is contained in:
Cameron Gutman 2022-04-04 21:36:25 -05:00 committed by Sam Lantinga
parent 7b3449b89f
commit 45372b1c27
1 changed files with 0 additions and 5 deletions
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5
src/video/x11/SDL_x11opengl.c
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@ -247,11 +247,6 @@ X11_GL_LoadLibrary(_THIS, const char *path)
X11_GL_UseEGL(_this) ) {
#if SDL_VIDEO_OPENGL_EGL
X11_GL_UnloadLibrary(_this);
/* Better avoid conflicts! */
if (_this->gl_config.dll_handle != NULL ) {
GL_UnloadObject(_this->gl_config.dll_handle);
_this->gl_config.dll_handle = NULL;
}
_this->GL_LoadLibrary = X11_GLES_LoadLibrary;
_this->GL_GetProcAddress = X11_GLES_GetProcAddress;
_this->GL_UnloadLibrary = X11_GLES_UnloadLibrary;