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authorHans Verkuil <hverkuil-cisco@xs4all.nl>2020-03-03 11:34:48 +0100
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-03-05 22:48:56 +0100
commit2fae4d6aabc8fb2d49f40b12a8f82bf730216f99 (patch)
tree48fc14cbb531f8e27e7799cc95e4ed9937cbcddf
parent34217262898a4c2cc5bef4ca476e9fb9f0bf19a8 (diff)
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.c11
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 2928c5e0a73d..93d33d1db4e8 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);
}

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