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| author | Min Li <lm0963hack@gmail.com> | 2023-05-26 21:01:31 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-28 10:29:53 +0200 |
| commit | f012d3037c15401dd72d8717806311dc4c568ea8 (patch) | |
| tree | bed7f94dca33421a036d78e43a3ab0170b689e58 | |
| parent | a44b4230d2ba6a8f6245ee02667f4a39b2d568ea (diff) | |
| download | linux-stable-f012d3037c15401dd72d8717806311dc4c568ea8.tar.gz linux-stable-f012d3037c15401dd72d8717806311dc4c568ea8.tar.bz2 linux-stable-f012d3037c15401dd72d8717806311dc4c568ea8.zip | |
drm/exynos: fix race condition UAF in exynos_g2d_exec_ioctl
[ Upstream commit 48bfd02569f5db49cc033f259e66d57aa6efc9a3 ]
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>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_g2d.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 471fd6c8135f..27613abeed96 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); |