[cairo-bugs] [Bug 77931] NULL pointer dereference : _clip_and_composite_boxes() tries to destroy __cairo_clip_all's path

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77931

--- Comment #2 from Uli Schlachter <psychon at znc.in> ---
Sadly no clear test case for this.

Since drawing with an all-clipped clip doesn't do anything at all, something
should notice this and return success early on.

Instead of your patch, could you try adding the following at the beginning of
_clip_and_composite_boxes()? Thanks (Hm, and I'd be curious how exactly this
can happen at all, the higher levels should check for all-clipped earlier, I
thought):

if (_cairo_clip_is_all_clipped (clip))
  return CAIRO_STATUS_SUCCESS;

(Sorry, my main work computer broke and I am having some problems due to this)

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