| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 54/92] drm/msm: fix memleak on release | Date | Wed, 11 Dec 2019 16:05:45 +0100 |
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From: Johan Hovold <johan@kernel.org>
commit a64fc11b9a520c55ca34d82e5ca32274f49b6b15 upstream.
If a process is interrupted while accessing the "gpu" debugfs file and the drm device struct_mutex is contended, release() could return early and fail to free related resources.
Note that the return value from release() is ignored.
Fixes: 4f776f4511c7 ("drm/msm/gpu: Convert the GPU show function to use the GPU state") Cc: stable <stable@vger.kernel.org> # 4.18 Cc: Jordan Crouse <jcrouse@codeaurora.org> Cc: Rob Clark <robdclark@gmail.com> Reviewed-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20191010131333.23635-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/gpu/drm/msm/msm_debugfs.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-)
--- a/drivers/gpu/drm/msm/msm_debugfs.c +++ b/drivers/gpu/drm/msm/msm_debugfs.c @@ -47,12 +47,8 @@ static int msm_gpu_release(struct inode struct msm_gpu_show_priv *show_priv = m->private; struct msm_drm_private *priv = show_priv->dev->dev_private; struct msm_gpu *gpu = priv->gpu; - int ret; - - ret = mutex_lock_interruptible(&show_priv->dev->struct_mutex); - if (ret) - return ret; + mutex_lock(&show_priv->dev->struct_mutex); gpu->funcs->gpu_state_put(show_priv->state); mutex_unlock(&show_priv->dev->struct_mutex);
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