On 9/13/2022 1:53 AM, Johan Hovold wrote:
The bridge counter was never reset when tearing down the DRM device so that stale pointers to deallocated structures would be accessed on the next tear down (e.g. after a second late bind deferral).
Given enough bridges and a few probe deferrals this could currently also lead to data beyond the bridge array being corrupted.
Fixes: d28ea556267c ("drm/msm: properly add and remove internal bridges") Fixes: a3376e3ec81c ("drm/msm: convert to drm_bridge") Cc: stable@vger.kernel.org # 3.12 Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org 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
drivers/gpu/drm/msm/msm_drv.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 391d86b54ded..d254fe2507ec 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -241,6 +241,7 @@ static int msm_drm_uninit(struct device *dev) for (i = 0; i < priv->num_bridges; i++) drm_bridge_remove(priv->bridges[i]);
- priv->num_bridges = 0;
pm_runtime_get_sync(dev); msm_irq_uninstall(ddev);