[Bug 70088] Glamor on r600g crashes Xserver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70088

--- Comment #7 from Vadim Girlin <ptpzz at yandex.ru> ---
Created attachment 87148
  --> https://bugs.freedesktop.org/attachment.cgi?id=87148&action=edit
patch

This patch should fix this issue.


(In reply to comment #6)
> It fixes my crash problem. Maybe code needs more checks for null values?
> As always my patch is subpar, You shouldn't use it.

Checking for null is not enough in this case, it may prevent segfault but
generated shader code would be incorrect anyway, when we have null there it
means that something is already broken.

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