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modesetting: Fix ms_covering_crtc() segfault with non-xf86Crtc slave

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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>
This commit is contained in:
Alex Goins 2019-09-17 18:03:34 -05:00 committed by Aaron Plattner
parent 3ef9029ace
commit 797e7a0ceb
1 changed files with 4 additions and 0 deletions
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4
hw/xfree86/drivers/modesetting/vblank.c
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@ -141,6 +141,10 @@ ms_covering_crtc(ScreenPtr pScreen, BoxPtr box, Bool screen_is_ms)
best_crtc = NULL;
best_coverage = 0;
if (!xf86_config)
return NULL;
for (c = 0; c < xf86_config->num_crtc; c++) {
crtc = xf86_config->crtc[c];