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because: - GeHint return a value pointer. - SetHint free internally the pointer - The -now invalid- pointer is re-read ==9363== Invalid read of size 1 ==9363== at 0x4946860: SW_CreateRenderer (SDL_render_sw.c:1044) ==9363== by 0x48F0EC3: SDL_CreateRenderer_REAL (SDL_render.c:938) ==9363== by 0x48C5921: SDL_CreateRenderer (SDL_dynapi_procs.h:332) ==9363== by 0x401584: main (main.c:421) ==9363== Address 0x9c24040 is 0 bytes inside a block of size 1 free'd ==9363== at 0x484621F: free (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so) ==9363== by 0x494E403: SDL_free_REAL (SDL_malloc.c:5432) ==9363== by 0x48A6153: SDL_SetHintWithPriority_REAL (SDL_hints.c:76) ==9363== by 0x48A6254: SDL_SetHint_REAL (SDL_hints.c:101)