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backend/drm: fix segfault in init_drm_surface
When surf->gbm was previously set, we destroy it without setting it to
NULL. Later on, we only create the GBM surface if surf->gbm is NULL.
This result in a use-after-free when we start using surf->gbm.
Closes: https://github.com/swaywm/wlroots/issues/1868
Closes: https://github.com/swaywm/wlroots/issues/1874
Closes: https://github.com/swaywm/sway/issues/4785
Closes: https://github.com/swaywm/sway/issues/4717
Closes: https://github.com/swaywm/sway/issues/4730
Fixes: 2bdd1d0896
("backend/drm: use modifiers for our GBM buffers")
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@ -81,6 +81,7 @@ bool init_drm_surface(struct wlr_drm_surface *surf,
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surf->back = NULL;
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}
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gbm_surface_destroy(surf->gbm);
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surf->gbm = NULL;
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}
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wlr_egl_destroy_surface(&surf->renderer->egl, surf->egl);
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