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drm/msm/hdmi: fix memory corruption with too many bridges

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commit 4c1294da6a upstream.

Add the missing sanity check on the bridge counter to avoid corrupting
data beyond the fixed-sized bridge array in case there are ever more
than eight bridges.

Fixes: a3376e3ec8 ("drm/msm: convert to drm_bridge")
Cc: stable@vger.kernel.org	# 3.12
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/502670/
Link: https://lore.kernel.org/r/20220913085320.8577-5-johan+linaro@kernel.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2022-09-13 10:53:14 +02:00 committed by Greg Kroah-Hartman
parent e83b354890
commit 9efb45b45f
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/msm/hdmi/hdmi.c
View file

@ -300,6 +300,11 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
struct platform_device *pdev = hdmi->pdev;
int ret;
if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
DRM_DEV_ERROR(dev->dev, "too many bridges\n");
return -ENOSPC;
}
hdmi->dev = dev;
hdmi->encoder = encoder;