* [BUG] Intel xorg driver 2.20.2 overlay off-by-one bug
@ 2012-08-12 9:01 Russell King - ARM Linux
2012-08-13 18:27 ` Chris Wilson
0 siblings, 1 reply; 2+ messages in thread
From: Russell King - ARM Linux @ 2012-08-12 9:01 UTC (permalink / raw)
To: intel-gfx, dri-devel
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 ">=".
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [BUG] Intel xorg driver 2.20.2 overlay off-by-one bug
2012-08-12 9:01 [BUG] Intel xorg driver 2.20.2 overlay off-by-one bug Russell King - ARM Linux
@ 2012-08-13 18:27 ` Chris Wilson
0 siblings, 0 replies; 2+ messages in thread
From: Chris Wilson @ 2012-08-13 18:27 UTC (permalink / raw)
To: Russell King - ARM Linux, intel-gfx, dri-devel
On Sun, 12 Aug 2012 10:01:44 +0100, Russell King - ARM Linux <linux@arm.linux.org.uk> wrote:
> 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 ">=".
Thanks for bringing this to our attention and poking Dave, who promptly
pushed a patch to fix the bug.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-08-12 9:01 [BUG] Intel xorg driver 2.20.2 overlay off-by-one bug Russell King - ARM Linux
2012-08-13 18:27 ` Chris Wilson
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