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CHROMIUM: drm: rockchip/dw_hdmi-rockchip: Protect against > 2GHz pixel clocks

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Add a check just to make sure that someone doesn't try to give us a
pixel clock that is > 2GHz.  If they did that, some of our math might
overflow, so it's good to make sure we don't do it.

Change-Id: I451602f0d771bb16b399b43e376e1054b7ee060f
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/284642
Reviewed-by: Alexandru Stan <amstan@chromium.org>
Signed-off-by: Algea Cao <algea.cao@rock-chips.com>
This commit is contained in:
Algea Cao
2021-07-27 10:03:59 +08:00
committed by Tao Huang
parent 52e7b391aa
commit 19b0683460
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
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@@ -263,6 +263,13 @@ dw_hdmi_rockchip_mode_valid(struct dw_hdmi *hdmi, void *data,
break;
}
}
/*
* Pixel clocks we support are always < 2GHz and so fit in an
* int. We should make sure source rate does too so we don't get
* overflow when we multiply by 1000.
*/
if (mode->clock > INT_MAX / 1000)
return MODE_BAD;
return (valid) ? MODE_OK : MODE_BAD;
}