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Subject[PATCH] drm/exynos: fix race condition UAF in exynos_g2d_exec_ioctl
Date
If it is async, runqueue_node is freed in g2d_runqueue_worker on another
worker thread. So in extreme cases, if g2d_runqueue_worker runs first, and
then executes the following if statement, there will be use-after-free.

Signed-off-by: Min Li <lm0963hack@gmail.com>
---
drivers/gpu/drm/exynos/exynos_drm_g2d.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
index ec784e58da5c..414e585ec7dd 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -1335,7 +1335,7 @@ int exynos_g2d_exec_ioctl(struct drm_device *drm_dev, void *data,
/* Let the runqueue know that there is work to do. */
queue_work(g2d->g2d_workq, &g2d->runqueue_work);

- if (runqueue_node->async)
+ if (req->async)
goto out;

wait_for_completion(&runqueue_node->complete);
--
2.34.1
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