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- Fix potential use-after-free issue in suspend/resume 

by cleanning up drvdata at unbind.
 - Fix potential NULL pointer dereference issue in suspend/resume
   by setting drm_dev after checking if drm_dev is null or not.
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Merge tag 'exynos-drm-fixes-for-v4.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos into drm-fixes

- Fix potential use-after-free issue in suspend/resume
  by cleanning up drvdata at unbind.
- Fix potential NULL pointer dereference issue in suspend/resume
  by setting drm_dev after checking if drm_dev is null or not.

* tag 'exynos-drm-fixes-for-v4.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos:
  drm/exynos: Clear drvdata after component unbind
  drm/exynos: Fix potential NULL pointer dereference in suspend/resume paths
This commit is contained in:
Dave Airlie 2017-10-17 10:14:56 +10:00
parent 33d930e59a 238604ca0b
commit 2de0307323
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/exynos/exynos_drm_drv.c
View File

@ -168,11 +168,13 @@ static struct drm_driver exynos_drm_driver = {
static int exynos_drm_suspend(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct exynos_drm_private *private = drm_dev->dev_private;
struct exynos_drm_private *private;
if (pm_runtime_suspended(dev) || !drm_dev)
return 0;
private = drm_dev->dev_private;
drm_kms_helper_poll_disable(drm_dev);
exynos_drm_fbdev_suspend(drm_dev);
private->suspend_state = drm_atomic_helper_suspend(drm_dev);
@ -188,11 +190,12 @@ static int exynos_drm_suspend(struct device *dev)
static int exynos_drm_resume(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct exynos_drm_private *private = drm_dev->dev_private;
struct exynos_drm_private *private;
if (pm_runtime_suspended(dev) || !drm_dev)
return 0;
private = drm_dev->dev_private;
drm_atomic_helper_resume(drm_dev, private->suspend_state);
exynos_drm_fbdev_resume(drm_dev);
drm_kms_helper_poll_enable(drm_dev);
@ -427,6 +430,7 @@ static void exynos_drm_unbind(struct device *dev)
kfree(drm->dev_private);
drm->dev_private = NULL;
dev_set_drvdata(dev, NULL);
drm_dev_unref(drm);
}