* [PATCH] media: vim2m: fix two double-free issues
@ 2019-05-13 7:18 Kefeng Wang
0 siblings, 0 replies; only message in thread
From: Kefeng Wang @ 2019-05-13 7:18 UTC (permalink / raw)
To: linux-media, linux-kernel
Cc: Kefeng Wang, Hans Verkuil, Laurent Pinchart,
Mauro Carvalho Chehab, Hulk Robot
vim2m_device_release() will be called by video_unregister_device() to release
various objects.
There are two double-free issue,
1. dev->m2m_dev will be freed twice in error_m2m path/vim2m_device_release
2. the error_v4l2 and error_free path in vim2m_probe() will release
same objects, since vim2m_device_release has done.
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: ea6c7e34f3b2 ("media: vim2m: replace devm_kzalloc by kzalloc")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
drivers/media/platform/vim2m.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/vim2m.c b/drivers/media/platform/vim2m.c
index 243c82b5d537..acd3bd48c7e2 100644
--- a/drivers/media/platform/vim2m.c
+++ b/drivers/media/platform/vim2m.c
@@ -1359,7 +1359,7 @@ static int vim2m_probe(struct platform_device *pdev)
MEDIA_ENT_F_PROC_VIDEO_SCALER);
if (ret) {
v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem media controller\n");
- goto error_m2m;
+ goto error_dev;
}
ret = media_device_register(&dev->mdev);
@@ -1373,11 +1373,11 @@ static int vim2m_probe(struct platform_device *pdev)
#ifdef CONFIG_MEDIA_CONTROLLER
error_m2m_mc:
v4l2_m2m_unregister_media_controller(dev->m2m_dev);
-error_m2m:
- v4l2_m2m_release(dev->m2m_dev);
#endif
error_dev:
video_unregister_device(&dev->vfd);
+ /* vim2m_device_release called by video_unregister_device to release various objects */
+ return ret;
error_v4l2:
v4l2_device_unregister(&dev->v4l2_dev);
error_free:
--
2.20.1
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