linux-kernel - [PATCH 4.20 115/145] media: vim2m: use cancel_delayed_work_sync instead of flush_schedule

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Date:   Mon,  7 Jan 2019 13:32:32 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans Verkuil <hverkuil-cisco@...all.nl>,
        syzbot+69780d144754b8071f4b@...kaller.appspotmail.com,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: [PATCH 4.20 115/145] media: vim2m: use cancel_delayed_work_sync instead of flush_schedule_work

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hans Verkuil <hverkuil-cisco@...all.nl>

commit 52117be68b82ee05c96da0a7beec319906ccf6cc upstream.

The use of flush_schedule_work() made no sense and caused a syzkaller error.
Replace with the correct cancel_delayed_work_sync().

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Reported-by: syzbot+69780d144754b8071f4b@...kaller.appspotmail.com
Cc: <stable@...r.kernel.org>      # for v4.20 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/platform/vim2m.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/media/platform/vim2m.c
+++ b/drivers/media/platform/vim2m.c
@@ -805,10 +805,11 @@ static int vim2m_start_streaming(struct
 static void vim2m_stop_streaming(struct vb2_queue *q)
 {
 	struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
+	struct vim2m_dev *dev = ctx->dev;
 	struct vb2_v4l2_buffer *vbuf;
 	unsigned long flags;
 
-	flush_scheduled_work();
+	cancel_delayed_work_sync(&dev->work_run);
 	for (;;) {
 		if (V4L2_TYPE_IS_OUTPUT(q->type))
 			vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);