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Apart from simplifying the code, this should also prevent a condition (which might only be possible with the following fix) reported in https://gitlab.freedesktop.org/wayland/weston/issues/115#note_52467: 1. xwl_present_timer_callback indirectly calls xwl_present_reset_timer -> xwl_present_free_timer 2. xwl_present_timer_callback then returns a non-0 value, so DoTimer calls TimerSet with the old xwl_present_window->frame_timer pointer which was freed in step 1 => use after free Calling xwl_present_reset_timer explicitly passes NULL to TimerSet if step 1 freed xwl_present_window->frame_timer, and it will allocate a new one. |
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