DIX ScreenRecs don't necessarily have an xf86CrtcConfigPtr DDX private.
ms_covering_crtc() assumes that they do, which can result in a segfault.
Update ms_covering_crtc() to check the XF86_CRTC_CONFIG_PTR() returned pointer
before dereferencing it. This will still mean that ms_covering_crtc() can't fall
back to the primary output when a drawable overlaps a slave output (going to the
1 FPS default instead), but it won't segfault.
Signed-off-by: Alex Goins <agoins@nvidia.com>
(cherry picked from commit
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| .. | ||
| Makefile.am | ||
| dri2.c | ||
| driver.c | ||
| driver.h | ||
| drmmode_display.c | ||
| drmmode_display.h | ||
| dumb_bo.c | ||
| dumb_bo.h | ||
| meson.build | ||
| modesetting.man | ||
| pageflip.c | ||
| present.c | ||
| vblank.c | ||