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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.
This commit is contained in:
Simon Ser 2021-08-10 13:18:00 +02:00 committed by Kenny Levinsen
parent 88f65db87f
commit eb0ce659cf
1 changed files with 11 additions and 4 deletions
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15
backend/drm/backend.c
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@ -227,7 +227,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
drm->gbm = gbm_create_device(drm->fd); drm->gbm = gbm_create_device(drm->fd);
if (!drm->gbm) { if (!drm->gbm) {
wlr_log(WLR_ERROR, "Failed to create GBM device"); wlr_log(WLR_ERROR, "Failed to create GBM device");
goto error_event; goto error_resources;
} }
if (drm->parent) { if (drm->parent) {
@ -237,7 +237,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
if (!init_drm_renderer(drm, &drm->mgpu_renderer)) { if (!init_drm_renderer(drm, &drm->mgpu_renderer)) {
wlr_log(WLR_ERROR, "Failed to initialize renderer"); wlr_log(WLR_ERROR, "Failed to initialize renderer");
goto error_event; goto error_resources;
} }
// We'll perform a multi-GPU copy for all submitted buffers, we need // We'll perform a multi-GPU copy for all submitted buffers, we need
@ -247,7 +247,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
wlr_renderer_get_dmabuf_texture_formats(renderer); wlr_renderer_get_dmabuf_texture_formats(renderer);
if (texture_formats == NULL) { if (texture_formats == NULL) {
wlr_log(WLR_ERROR, "Failed to query renderer texture formats"); wlr_log(WLR_ERROR, "Failed to query renderer texture formats");
goto error_event; goto error_mgpu_renderer;
} }
// Force a linear layout. In case explicit modifiers aren't supported, // Force a linear layout. In case explicit modifiers aren't supported,
@ -265,7 +265,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
struct wlr_renderer *renderer = wlr_backend_get_renderer(&drm->backend); struct wlr_renderer *renderer = wlr_backend_get_renderer(&drm->backend);
struct wlr_allocator *allocator = backend_get_allocator(&drm->backend); struct wlr_allocator *allocator = backend_get_allocator(&drm->backend);
if (renderer == NULL || allocator == NULL) { if (renderer == NULL || allocator == NULL) {
goto error_event; goto error_mgpu_renderer;
} }
drm->session_destroy.notify = handle_session_destroy; drm->session_destroy.notify = handle_session_destroy;
@ -276,10 +276,17 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
return &drm->backend; return &drm->backend;
error_mgpu_renderer:
finish_drm_renderer(&drm->mgpu_renderer);
error_resources:
finish_drm_resources(drm);
error_event: error_event:
wl_list_remove(&drm->session_active.link); wl_list_remove(&drm->session_active.link);
wl_event_source_remove(drm->drm_event); wl_event_source_remove(drm->drm_event);
error_fd: error_fd:
wl_list_remove(&drm->dev_remove.link);
wl_list_remove(&drm->dev_change.link);
wl_list_remove(&drm->parent_destroy.link);
wlr_session_close_file(drm->session, dev); wlr_session_close_file(drm->session, dev);
free(drm); free(drm);
return NULL; return NULL;