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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>
This commit is contained in:
Yakir Yang
2016-07-16 16:42:32 +08:00
committed by Huang, Tao
parent bc29e00861
commit 8974d5e9bd
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/rockchip/dw_hdmi-rockchip.c
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@@ -243,6 +243,14 @@ dw_hdmi_rockchip_mode_valid(struct drm_connector *connector,
int num_rates = ARRAY_SIZE(dw_hdmi_rates);
int i;
/*
* 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;
for (i = 0; i < num_rates; i++) {
int slop = CLK_SLOP(pclk);