This is a note to let you know that I've just added the patch titled

drm/msm: Take the mutex before calling msm_gem_new_impl

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: drm-msm-take-the-mutex-before-calling-msm_gem_new_impl.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Apr 9 17:09:24 CEST 2018

From: Jordan Crouse jcrouse@codeaurora.org Date: Mon, 8 May 2017 14:34:57 -0600 Subject: drm/msm: Take the mutex before calling msm_gem_new_impl

From: Jordan Crouse jcrouse@codeaurora.org

[ Upstream commit 90dd57de4a043f642179b1323a31ca3ced826611 ]

Amongst its other duties, msm_gem_new_impl adds the newly created GEM object to the shared inactive list which may also be actively modifiying the list during submission. All the paths to modify the list are protected by the mutex except for the one through msm_gem_import which can end up causing list corruption.

Signed-off-by: Jordan Crouse jcrouse@codeaurora.org [add extra WARN_ON(!mutex_is_locked(&dev->struct_mutex))] Signed-off-by: Rob Clark robdclark@gmail.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/msm/msm_gem.c | 6 ++++++ 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -770,6 +770,8 @@ static int msm_gem_new_impl(struct drm_d unsigned sz; bool use_vram = false;

+ WARN_ON(!mutex_is_locked(&dev->struct_mutex)); + switch (flags & MSM_BO_CACHE_MASK) { case MSM_BO_UNCACHED: case MSM_BO_CACHED: @@ -863,7 +865,11 @@ struct drm_gem_object *msm_gem_import(st

size = PAGE_ALIGN(dmabuf->size);

+ /* Take mutex so we can modify the inactive list in msm_gem_new_impl */ + mutex_lock(&dev->struct_mutex); ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj); + mutex_unlock(&dev->struct_mutex); + if (ret) goto fail;

Patches currently in stable-queue which might be from jcrouse@codeaurora.org are

queue-4.9/drm-msm-take-the-mutex-before-calling-msm_gem_new_impl.patch