[PATCH 1/7] drm/msm: fix use-after-free on probe deferral

[Johan Hovold]

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 at vger.kernel.org      # 5.19
Signed-off-by: Johan Hovold <johan+linaro at 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