[PATCH 4.9 014/223] media: media_device_enum_links32: clean a reserved field

Greg Kroah-Hartman
2019-08-02T10:03:37Z

[ Upstream commit f49308878d7202e07d8761238e01bd0e5fce2750 ]

In v4l2-compliance utility, test MEDIA_IOC_ENUM_ENTITIES
will check whether reserved field of media_links_enum filled
with zero.

However, for 32 bit program, the reserved field is missing
copy from kernel space to user space in media_device_enum_links32
function.

This patch adds the cleaning a reserved field logic in
media_device_enum_links32 function.

Signed-off-by: Jungo Lin <jungo.lin@mediatek.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/media-device.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index 6f46c59415fe..6062c0cfa632 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -474,6 +474,7 @@ static long media_device_enum_links32(struct media_device *mdev,
{
struct media_links_enum links;
compat_uptr_t pads_ptr, links_ptr;
+ int ret;

memset(&links, 0, sizeof(links));

@@ -485,7 +486,13 @@ static long media_device_enum_links32(struct media_device *mdev,
links.pads = compat_ptr(pads_ptr);
links.links = compat_ptr(links_ptr);

- return media_device_enum_links(mdev, &links);
+ ret = media_device_enum_links(mdev, &links);
+ if (ret)
+ return ret;
+
+ memset(ulinks->reserved, 0, sizeof(ulinks->reserved));
+
+ return 0;
}

#define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
--
2.20.1