linux-kernel - [PATCH] videobuf_qbuf: fix? possible videobuf

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Message-ID: <20070123175714.GA299@tv-sign.ru>
Date:	Tue, 23 Jan 2007 20:57:14 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	mchehab@...radead.org
Cc:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Chris Wright <chrisw@...s-sol.org>
Subject: [PATCH] videobuf_qbuf: fix? possible videobuf_queue->stream corruption and lockup

I am pretty sure the bug is real, but the patch may be wrong, please review.

We are doing ->buf_prepare(buf) before adding buf to q->stream list. This
means that videobuf_qbuf() should not try to re-add a STATE_PREPARED buffer.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 6.19/drivers/media/video/video-buf.c~v4l_lockup	2006-11-17 19:42:25.000000000 +0300
+++ 6.19/drivers/media/video/video-buf.c	2007-01-23 19:44:19.000000000 +0300
@@ -700,6 +700,7 @@ videobuf_qbuf(struct videobuf_queue *q,
 		goto done;
 	}
 	if (buf->state == STATE_QUEUED ||
+	    buf->state == STATE_PREPARED ||
 	    buf->state == STATE_ACTIVE) {
 		dprintk(1,"qbuf: buffer is already queued or active.\n");
 		goto done;

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