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authorHans Verkuil <hverkuil@xs4all.nl>2018-12-18 08:37:08 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-27 14:13:53 +0900
commit3616a46e4622df40e2d9c1a22c305e769eff9775 (patch)
treeefac371afc4abdd4659701f18befd65b13f50a42 /drivers/media
parent33fb49969357376c93a20ba6fd55087b8c181ae6 (diff)
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media: v4l2-ctrls.c/uvc: zero v4l2_event
commit f45f3f753b0a3d739acda8e311b4f744d82dc52a upstream. Control events can leak kernel memory since they do not fully zero the event. The same code is present in both v4l2-ctrls.c and uvc_ctrl.c, so fix both. It appears that all other event code is properly zeroing the structure, it's these two places. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Reported-by: syzbot+4f021cf3697781dbd9fb@syzkaller.appspotmail.com Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/usb/uvc/uvc_ctrl.c2
-rw-r--r--drivers/media/v4l2-core/v4l2-ctrls.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 20397aba6849..d92967e2e385 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1203,7 +1203,7 @@ static void uvc_ctrl_fill_event(struct uvc_video_chain *chain,
__uvc_query_v4l2_ctrl(chain, ctrl, mapping, &v4l2_ctrl);
- memset(ev->reserved, 0, sizeof(ev->reserved));
+ memset(ev, 0, sizeof(*ev));
ev->type = V4L2_EVENT_CTRL;
ev->id = v4l2_ctrl.id;
ev->u.ctrl.value = value;
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 8033d6f73501..07bd2008ae4b 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -1239,7 +1239,7 @@ static u32 user_flags(const struct v4l2_ctrl *ctrl)
static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes)
{
- memset(ev->reserved, 0, sizeof(ev->reserved));
+ memset(ev, 0, sizeof(*ev));
ev->type = V4L2_EVENT_CTRL;
ev->id = ctrl->id;
ev->u.ctrl.changes = changes;