Messages in this thread Patch in this message | | | From | Johan Hovold <> | Subject | [PATCH 1/7] drm/msm: fix use-after-free on probe deferral | Date | Mon, 12 Sep 2022 17:40:40 +0200 |
| |
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") Cc: stable@vger.kernel.org # 5.19 Signed-off-by: Johan Hovold <johan+linaro@kernel.org> --- 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); -- 2.35.1
| |