[PATCH 3.2 105/126] [media] media: info leak in __media_device_enum_links()

Ben Hutchings
2017-02-15T22:59:29Z

From: Dan Carpenter <dan.carpenter@oracle.com>

commit c88e739b1fad662240e99ecbd0bdaac871717987 upstream.

These structs have holes and reserved struct members which aren't
cleared. I've added a memset() so we don't leak stack information.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/media/media-device.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/media/media-device.c
+++ b/drivers/media/media-device.c
@@ -142,6 +142,8 @@ static long media_device_enum_links(stru

for (p = 0; p < entity->num_pads; p++) {
struct media_pad_desc pad;
+
+ memset(&pad, 0, sizeof(pad));
media_device_kpad_to_upad(&entity->pads[p], &pad);
if (copy_to_user(&links.pads[p], &pad, sizeof(pad)))
return -EFAULT;
@@ -159,6 +161,7 @@ static long media_device_enum_links(stru
if (entity->links[l].source->entity != entity)
continue;

+ memset(&link, 0, sizeof(link));
media_device_kpad_to_upad(entity->links[l].source,
&link.source);
media_device_kpad_to_upad(entity->links[l].sink,