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Avoid segfaults in XF86VidMode GammaRamp functions if randr_crtc is NULL

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Fixes crash when xscreensaver tries to use GammaRamp calls to fade out
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6915712

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Alan Coopersmith 2010-01-26 22:25:04 -08:00 committed by Keith Packard
parent 19d03d4f49
commit 0038290728
1 changed files with 18 additions and 13 deletions
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31
hw/xfree86/common/xf86cmap.c
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@ -1004,12 +1004,14 @@ xf86ChangeGammaRamp(
xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
RRCrtcPtr crtc = config->output[config->compat_output]->crtc->randr_crtc;
if (crtc->gammaSize != size)
return BadValue;
if (crtc) {
if (crtc->gammaSize != size)
return BadValue;
RRCrtcGammaSet(crtc, red, green, blue);
RRCrtcGammaSet(crtc, red, green, blue);
return Success;
return Success;
}
}
if(CMapScreenKey == NULL)
@ -1077,7 +1079,8 @@ xf86GetGammaRampSize(ScreenPtr pScreen)
xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
RRCrtcPtr crtc = config->output[config->compat_output]->crtc->randr_crtc;
return crtc->gammaSize;
if (crtc)
return crtc->gammaSize;
}
if(CMapScreenKey == NULL) return 0;
@ -1106,17 +1109,19 @@ xf86GetGammaRamp(
xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(pScrn);
RRCrtcPtr crtc = config->output[config->compat_output]->crtc->randr_crtc;
if (crtc->gammaSize < size)
return BadValue;
if (crtc) {
if (crtc->gammaSize < size)
return BadValue;
if (!RRCrtcGammaGet(crtc))
return BadImplementation;
if (!RRCrtcGammaGet(crtc))
return BadImplementation;
memcpy(red, crtc->gammaRed, size * sizeof(*red));
memcpy(green, crtc->gammaGreen, size * sizeof(*green));
memcpy(blue, crtc->gammaBlue, size * sizeof(*blue));
memcpy(red, crtc->gammaRed, size * sizeof(*red));
memcpy(green, crtc->gammaGreen, size * sizeof(*green));
memcpy(blue, crtc->gammaBlue, size * sizeof(*blue));
return Success;
return Success;
}
}
if(CMapScreenKey == NULL)