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bugfix: add null check on output gbm on pageflip

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The gbm for the output might be null for the pageflip in the case that
the output has been disconnected. The gbm might be set to null by
wlr_drm_output_cleanup() in this case.

If the output is cleaned up before the pageflip, then a double free
will crash the compositor on the call to gbm_surface_release_buffer()
in the pageflip handler. The outputs buffer object bo[1] will point to
invalid memory.
This commit is contained in:
Tony Crisci 2017-07-24 19:50:13 -04:00
parent 13f3c69ec6
commit 8b6dc48355
1 changed files with 1 additions and 1 deletions
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2
backend/drm/drm.c
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@ -631,7 +631,7 @@ static void page_flip_handler(int fd, unsigned seq,
struct wlr_backend_state *state = struct wlr_backend_state *state =
wl_container_of(output->renderer, state, renderer); wl_container_of(output->renderer, state, renderer);
if (output->bo[1]) { if (output->gbm && output->bo[1]) {
gbm_surface_release_buffer(output->gbm, output->bo[1]); gbm_surface_release_buffer(output->gbm, output->bo[1]);
output->bo[1] = NULL; output->bo[1] = NULL;
} }