[PATCH] Avoid segfaults in XF86VidMode GammaRamp functions if randr_crtc is NULL

[Keith Packard]

On Tue, 23 Feb 2010 15:02:40 +0100, Brice Goglin <Brice.Goglin at ens-lyon.org> wrote:

> See some debugging in
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=554450#31
> 
> Does this ring any bell ?

yeah, this makes sense -- the compat_output has recently been redefined
to be the same as the 'primary' output, and that output may well be
turned off, in which case you'd get a crash looking for the crtc
attached to it.

Fixing this will require reviewing all uses of compat_output and
ensuring that they check for a NULL crtc.

-- 
keith.packard at intel.com
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