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desktop/output: Clear repaint timer earlier in destroy

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The teardown of a sway_output is split in two: begin_destroy and
output_destroy. The former clears some state such as NULL'ing the
reference to wlr_output, while the latter frees the struct and its
remaining resources.

If an output is destroyed while a repaint timer is pending, future frame
callbacks will no longer occur as the listener is torn down in
begin_destroy, but the repaint timer is not torn down and may still
fire until output_destroy is hit. As begin_destroy cleared the reference
to wlr_output, this leads to a NULL-pointer dereference.

Tear down the repaint timer in begin_destroy as there is no need for it.

Fixes: fdc4318ac6 ("desktop/output: Clear frame_pending even output is disabled")
This commit is contained in:
Kenny Levinsen 2024-11-17 21:43:31 +01:00 • committed by Alexander Orzechowski
parent fec3da7d58
commit 5312376077
2 changed files with 3 additions and 1 deletions
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3
sway/desktop/output.c
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@ -440,6 +440,9 @@ static void begin_destroy(struct sway_output *output) {
output->wlr_output->data = NULL; output->wlr_output->data = NULL;
output->wlr_output = NULL; output->wlr_output = NULL;
wl_event_source_remove(output->repaint_timer);
output->repaint_timer = NULL;
request_modeset(); request_modeset();
} }

1
sway/tree/output.c
View file

@ -273,7 +273,6 @@ void output_destroy(struct sway_output *output) {
destroy_scene_layers(output); destroy_scene_layers(output);
list_free(output->workspaces); list_free(output->workspaces);
list_free(output->current.workspaces); list_free(output->current.workspaces);
wl_event_source_remove(output->repaint_timer);
wlr_color_transform_unref(output->color_transform); wlr_color_transform_unref(output->color_transform);
free(output); free(output);
} }