Subject: [PATCH] media: media_device_enum_links32: clean a reserved field

From: Jungo Lin <[email-masked]>
Date: Wed, 3 Apr 2019 09:44:27 +0800

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 <[email-masked]>
---
Changes since v1
- Revised the reserved field handling logic

 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 b8ec886..6893843 100644
--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -502,6 +502,7 @@ 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));
 
@@ -513,7 +514,13 @@ 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)
-- 
1.9.1

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