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Avoid dereferencing NULL pScreen in xf86CrtcSetModeTransform(). 

We can get there during PreInit as we set a mode for load detection.
At that time there's no pScreen anywhere, so just skip the optimization
then.
This commit is contained in:
Kristian Høgsberg 2008-12-01 12:41:10 -05:00
parent b0d371ab0a
commit 09df7cc5ad
1 changed files with 8 additions and 4 deletions
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12
hw/xfree86/modes/xf86Crtc.c
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@ -294,10 +294,14 @@ xf86CrtcSetModeTransform (xf86CrtcPtr crtc, DisplayModePtr mode, Rotation rotati
} else
crtc->transformPresent = FALSE;
/* xf86CrtcFitsScreen() relies on these values being correct. */
/* This should ensure the values are always set at modeset time. */
pScreen->width = scrn->virtualX;
pScreen->height = scrn->virtualY;
/* We may hit this path during PreInit during load-detcect, at
* which point no pScreens exist yet, so avoid this step. */
if (pScreen) {
/* xf86CrtcFitsScreen() relies on these values being correct. */
/* This should ensure the values are always set at modeset time. */
pScreen->width = scrn->virtualX;
pScreen->height = scrn->virtualY;
}
/* Shift offsets that move us out of virtual size */
if (x + mode->HDisplay > xf86_config->maxWidth ||