Re: [PATCH] drm: Fix possible race conditions while unplugging DRM device

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ping

On 05/22/2018 05:13 PM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

When unplugging a hotpluggable DRM device we first unregister it
with drm_dev_unregister and then set drm_device.unplugged flag which
is used to mark device critical sections with drm_dev_enter()/
drm_dev_exit() preventing access to device resources that are not
available after the device is gone.
But drm_dev_unregister may lead to hotplug uevent(s) fired to
user-space on card and/or connector removal, thus making it possible
for user-space to try accessing a disconnected device.

Fix this by first making sure device is properly marked as
disconnected and only then unregister it.

Fixes: bee330f3d672 ("drm: Use srcu to protect drm_device.unplugged")

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
Reported-by: Andrii Chepurnyi <andrii_chepurnyi@xxxxxxxx>
Cc: "Noralf Trønnes" <noralf@xxxxxxxxxxx>
---
  drivers/gpu/drm/drm_drv.c | 14 +++++++-------
  1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index b553a6f2ff0e..7af748ed1c58 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -369,13 +369,6 @@ EXPORT_SYMBOL(drm_dev_exit);
   */
  void drm_dev_unplug(struct drm_device *dev)
  {
-	drm_dev_unregister(dev);
-
-	mutex_lock(&drm_global_mutex);
-	if (dev->open_count == 0)
-		drm_dev_put(dev);
-	mutex_unlock(&drm_global_mutex);
-
  	/*
  	 * After synchronizing any critical read section is guaranteed to see
  	 * the new value of ->unplugged, and any critical section which might
@@ -384,6 +377,13 @@ void drm_dev_unplug(struct drm_device *dev)
  	 */
  	dev->unplugged = true;
  	synchronize_srcu(&drm_unplug_srcu);
+
+	drm_dev_unregister(dev);
+
+	mutex_lock(&drm_global_mutex);
+	if (dev->open_count == 0)
+		drm_dev_put(dev);
+	mutex_unlock(&drm_global_mutex);
  }
  EXPORT_SYMBOL(drm_dev_unplug);

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