crtc/gamma: check xf86_config is valid before using it.
If you have multiple cards, some that support randr 1.2 and some that don't you can get a null dereference in here. Signed-off-by: Dave Airlie <airlied@redhat.com>
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@ -3140,6 +3140,9 @@ xf86_crtc_supports_gamma(ScrnInfoPtr pScrn)
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xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
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xf86CrtcPtr crtc;
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/* for multiple drivers loaded we need this */
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if (!xf86_config)
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return FALSE;
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if (xf86_config->num_crtc == 0)
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return FALSE;
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crtc = xf86_config->crtc[0];
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