media: media_device_enum_links32: clean a reserved field

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>

diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
index b8ec886..6893843 100644 (file)
--- 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)