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Fail CRTC configuration if !vtSema

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Unless we check for vtSema before calling into the CRTC and output callbacks,
we may end up trying to access video memory that no longer exists, leading to a
crash.  So if we don't have vtSema, return FALSE to the caller, indicating that
we didn't do anything.

Fixes #14444.
(cherry picked from commit bee2ddf35f)
This commit is contained in:
Jesse Barnes 2008-03-17 08:33:01 -07:00 • committed by Adam Jackson
parent 727e22c830
commit 4f0755d6d4
1 changed files with 3 additions and 0 deletions
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3
hw/xfree86/modes/xf86RandR12.c
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@ -717,6 +717,9 @@ xf86RandR12CrtcSet (ScreenPtr pScreen,
xf86CrtcPtr *save_crtcs;
Bool save_enabled = crtc->enabled;
if (!crtc->scrn->vtSema)
return FALSE;
save_crtcs = xalloc(config->num_output * sizeof (xf86CrtcPtr));
if ((randr_mode != NULL) != crtc->enabled)
changed = TRUE;