drm/i915: Hold mutex across i915_gem_release
authorChris Wilson <chris@chris-wilson.co.uk>
Wed, 4 Dec 2013 14:52:06 +0000 (14:52 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 9 Jan 2014 20:25:10 +0000 (12:25 -0800)
commit 0d1430a3f4b7cfd8779b78740a4182321f3ca7f3 upstream.

Inorder to serialise the closing of the file descriptor and its
subsequent release of client requests with i915_gem_free_request(), we
need to hold the struct_mutex in i915_gem_release(). Failing to do so
has the potential to trigger an OOPS, later with a use-after-free.

Testcase: igt/gem_close_race
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70874
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71029
Reported-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/i915/i915_dma.c
drivers/gpu/drm/i915/i915_gem_context.c

index d5c784d..34b55ee 100644 (file)
@@ -1848,8 +1848,10 @@ void i915_driver_lastclose(struct drm_device * dev)
 
 void i915_driver_preclose(struct drm_device * dev, struct drm_file *file_priv)
 {
+       mutex_lock(&dev->struct_mutex);
        i915_gem_context_close(dev, file_priv);
        i915_gem_release(dev, file_priv);
+       mutex_unlock(&dev->struct_mutex);
 }
 
 void i915_driver_postclose(struct drm_device *dev, struct drm_file *file)
index 403309c..0350e2c 100644 (file)
@@ -328,10 +328,8 @@ void i915_gem_context_close(struct drm_device *dev, struct drm_file *file)
 {
        struct drm_i915_file_private *file_priv = file->driver_priv;
 
-       mutex_lock(&dev->struct_mutex);
        idr_for_each(&file_priv->context_idr, context_idr_cleanup, NULL);
        idr_destroy(&file_priv->context_idr);
-       mutex_unlock(&dev->struct_mutex);
 }
 
 static struct i915_hw_context *