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Bug 5190

Summary: [REGRESSION] SDL_EGL_LoadLibrary() leaks GL library reference
Product: SDL Reporter: Cameron Gutman <cameron.gutman>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 Keywords: target-2.0.14
Version: 2.0.12   
Hardware: x86_64   
OS: Linux   

Description Cameron Gutman 2020-06-14 21:02:20 UTC 
The modifications in https://hg.libsdl.org/SDL/rev/9692ad570003 changed SDL_EGL_LoadLibraryOnly() to set '_this->gl_config.driver_loaded = 1'. The problem is that the caller, SDL_GL_LoadLibrary(), is already going to increment '_this->gl_config.driver_loaded' after SDL_EGL_LoadLibrary() returns. This leads to an extra reference being put on the GL library, and as a result, it is never unloaded in SDL_GL_UnloadLibrary() when SDL_DestroyWindow() is called.

See the double-referencing callstack below:
#1  SDL_EGL_LoadLibraryOnly (_this=0xd49a60, egl_path=0x0)
#2  SDL_EGL_LoadLibrary (_this=0xd49a60, egl_path=<optimized out>, native_display=0xd657e0, platform=0)
#3  SDL_GL_LoadLibrary_REAL (path=path@entry=0x0)
#4  SDL_RecreateWindow (window=window@entry=0xd4d980, flags=flags@entry=10)
#5  GLES2_CreateRenderer (window=0xd4d980, flags=2)
#6  SDL_CreateRenderer_REAL (window=0xd4d980, index=1, flags=2)

The driver_loaded count is referenced at both SDL_EGL_LoadLibraryOnly() and SDL_GL_LoadLibrary_REAL() frames.
Comment 1 Ryan C. Gordon 2020-07-16 17:20:00 UTC 
This is now fixed in https://hg.libsdl.org/SDL/rev/aa751acb2966, thanks!

--ryan.