Commit a64fc11b authored by Johan Hovold's avatar Johan Hovold Committed by Sean Paul

drm/msm: fix memleak on release

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: 4f776f45 ("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: default avatarRob Clark <robdclark@gmail.com>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191010131333.23635-2-johan@kernel.org
parent 3ca3a9ea
......@@ -47,12 +47,8 @@ static int msm_gpu_release(struct inode *inode, struct file *file)
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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