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media: exynos4-is: Fix a use after free in isp_video_release 

In isp_video_release, file->private_data is freed via
_vb2_fop_release()->v4l2_fh_release(). But the freed
file->private_data is still used in v4l2_fh_is_singular_file()
->v4l2_fh_is_singular(file->private_data), which is a use
after free bug.

My patch uses a variable 'is_singular_file' to avoid the uaf.
v3: https://lore.kernel.org/patchwork/patch/1419058/

Fixes: 34947b8aeb ("[media] exynos4-is: Add the FIMC-IS ISP capture DMA driver")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Lv Yunlong 2021-05-09 10:12:31 +02:00 committed by Mauro Carvalho Chehab
parent f9c2fd3bb8
commit 01fe904c9a
1 changed files with 5 additions and 2 deletions
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7
drivers/media/platform/exynos4-is/fimc-isp-video.c
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@ -305,17 +305,20 @@ static int isp_video_release(struct file *file)
struct fimc_is_video *ivc = &isp->video_capture;
struct media_entity *entity = &ivc->ve.vdev.entity;
struct media_device *mdev = entity->graph_obj.mdev;
bool is_singular_file;
mutex_lock(&isp->video_lock);
if (v4l2_fh_is_singular_file(file) && ivc->streaming) {
is_singular_file = v4l2_fh_is_singular_file(file);
if (is_singular_file && ivc->streaming) {
media_pipeline_stop(entity);
ivc->streaming = 0;
}
_vb2_fop_release(file, NULL);
if (v4l2_fh_is_singular_file(file)) {
if (is_singular_file) {
fimc_pipeline_call(&ivc->ve, close);
mutex_lock(&mdev->graph_mutex);