While reading through the Intel driver code, I spotted this in
I830SetPortAttributeOverlay:
} else if (attribute == xvPipe) {
xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
if ((value < -1) || (value > xf86_config->num_crtc))
return BadValue;
if (value < 0)
adaptor_priv->desired_crtc = NULL;
else
adaptor_priv->desired_crtc = xf86_config->crtc[value];
This allows value == xf86_config->num_crtc to be valid, which would be
the CRTC number _after_ the last one in the array. Presumably this is
not desired, and the test should be ">=".
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