linux-kernel - [PATCH v2] vb2: Check if there are buffers before streamon

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Message-Id: <1389110028-17534-1-git-send-email-ricardo.ribalda@gmail.com>
Date:	Tue,  7 Jan 2014 16:53:48 +0100
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Pawel Osciak <pawel@...iak.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	"open list:VIDEOBUF2 FRAMEWORK" <linux-media@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Subject: [PATCH v2] vb2: Check if there are buffers before streamon

This patch adds a test preventing streamon() if there is no buffer
ready.

Without this patch, a user could call streamon() before
preparing any buffer. This leads to a situation where if he calls
close() before calling streamoff() the device is kept streaming.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
---
v2: Comment by Marek Szyprowski:
Reword error message
 drivers/media/v4l2-core/videobuf2-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 098df28..6f20e5a 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1776,6 +1776,11 @@ static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
 		return 0;
 	}
 
+	if (!q->num_buffers) {
+		dprintk(1, "streamon: no frames have been requested\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * If any buffers were queued before streamon,
 	 * we can now pass them to driver for processing.
-- 
1.8.5.2

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