From b3dc3d7cf248c2225cd38f6dc54b47d8e012247e Mon Sep 17 00:00:00 2001
From: Paul Elder <paul.elder@ideasonboard.com>
Date: Thu, 18 Jun 2020 17:25:36 +0900
Subject: v4l2: v4l2_camera_proxy: Disallow dqbuf when not streaming

Make VIDIOC_DQBUF return -EINVAL if the stream is not turned on.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 src/v4l2/v4l2_camera_proxy.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/v4l2')

diff --git a/src/v4l2/v4l2_camera_proxy.cpp b/src/v4l2/v4l2_camera_proxy.cpp
index 0099266e..08fd3fdc 100644
--- a/src/v4l2/v4l2_camera_proxy.cpp
+++ b/src/v4l2/v4l2_camera_proxy.cpp
@@ -580,6 +580,9 @@ int V4L2CameraProxy::vidioc_dqbuf(V4L2CameraFile *file, struct v4l2_buffer *arg)
 	if (!hasOwnership(file))
 		return -EBUSY;
 
+	if (!vcam_->isRunning())
+		return -EINVAL;
+
 	if (!validateBufferType(arg->type) ||
 	    !validateMemoryType(arg->memory))
 		return -EINVAL;
-- 
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