backend/drm: add proper error handling to wlr_drm_backend_create
Some listeners weren't removed and caused a use-after-free with e.g. vkms when used as a secondary GPU.
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@ -227,7 +227,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
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drm->gbm = gbm_create_device(drm->fd);
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if (!drm->gbm) {
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wlr_log(WLR_ERROR, "Failed to create GBM device");
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goto error_event;
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goto error_resources;
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}
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if (drm->parent) {
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@ -237,7 +237,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
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if (!init_drm_renderer(drm, &drm->mgpu_renderer)) {
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wlr_log(WLR_ERROR, "Failed to initialize renderer");
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goto error_event;
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goto error_resources;
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}
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// We'll perform a multi-GPU copy for all submitted buffers, we need
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@ -247,7 +247,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
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wlr_renderer_get_dmabuf_texture_formats(renderer);
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if (texture_formats == NULL) {
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wlr_log(WLR_ERROR, "Failed to query renderer texture formats");
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goto error_event;
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goto error_mgpu_renderer;
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}
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// Force a linear layout. In case explicit modifiers aren't supported,
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@ -265,7 +265,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
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struct wlr_renderer *renderer = wlr_backend_get_renderer(&drm->backend);
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struct wlr_allocator *allocator = backend_get_allocator(&drm->backend);
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if (renderer == NULL || allocator == NULL) {
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goto error_event;
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goto error_mgpu_renderer;
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}
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drm->session_destroy.notify = handle_session_destroy;
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@ -276,10 +276,17 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
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return &drm->backend;
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error_mgpu_renderer:
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finish_drm_renderer(&drm->mgpu_renderer);
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error_resources:
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finish_drm_resources(drm);
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error_event:
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wl_list_remove(&drm->session_active.link);
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wl_event_source_remove(drm->drm_event);
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error_fd:
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wl_list_remove(&drm->dev_remove.link);
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wl_list_remove(&drm->dev_change.link);
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wl_list_remove(&drm->parent_destroy.link);
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wlr_session_close_file(drm->session, dev);
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free(drm);
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return NULL;
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