[cairo-bugs] [Bug 91967] Assertion "(_cairo_atomic_int_get (&(&surface->ref_count)->ref_count) > 0)"

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue May 24 12:49:07 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=91967

--- Comment #24 from Alberts Muktup─üvels <alberts.muktupavels at gmail.com> ---
(In reply to Jaroslav Škarvada from comment #23)
> But I think the proposed fix is dirty. It relies on the safety check inside
> the cairo_surface_destroy. Cleanly written code shouldn't do this. The
> control flow should never get into the cairo_surface_destroy for the second
> time, that's why I wrote "maybe there is a better fix". But this is
> definitely question for the upstream maintainers.

I don't want to agree on this.

Check what could happen if it is called this way:
_get_image_surface (..., ..., FALSE);

I am too lazy to count, but there are definitely multiple paths that could end
up calling cairo_surface_destroy (&image->base); when image is still NULL.

Think about this way - setting it to NULL after destroying is same as if that
function would have been called with try_shm = FALSE.

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