diff options
| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2020-03-03 11:34:48 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-03-05 22:48:56 +0100 |
| commit | 2fae4d6aabc8fb2d49f40b12a8f82bf730216f99 (patch) | |
| tree | 48fc14cbb531f8e27e7799cc95e4ed9937cbcddf | |
| parent | 34217262898a4c2cc5bef4ca476e9fb9f0bf19a8 (diff) | |
| download | linux-0-day-2fae4d6aabc8fb2d49f40b12a8f82bf730216f99.tar.gz linux-0-day-2fae4d6aabc8fb2d49f40b12a8f82bf730216f99.tar.xz | |
media: v4l2-ctrls: v4l2_ctrl_request_complete() should always set ref->req
When the request is completed, all controls are copied to the request object.
However, when VIDIOC_G_EXT_CTRLS attempts to read control values from the
request it will read the current value instead for any control reference that
has a NULL ref->req pointer. But that's wrong: after completing the request
*all* controls should have a non-NULL ref->req pointer since they are after
all copied to the request.
So set ref->req if it wasn't set already.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-ctrls.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index 2928c5e0a73df..93d33d1db4e83 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -4296,10 +4296,17 @@ void v4l2_ctrl_request_complete(struct media_request *req, continue; v4l2_ctrl_lock(ctrl); - if (ref->req) + if (ref->req) { ptr_to_ptr(ctrl, ref->req->p_req, ref->p_req); - else + } else { ptr_to_ptr(ctrl, ctrl->p_cur, ref->p_req); + /* + * Set ref->req to ensure that when userspace wants to + * obtain the controls of this request it will take + * this value and not the current value of the control. + */ + ref->req = ref; + } v4l2_ctrl_unlock(ctrl); } |