linux-kernel - [PATCH] Fix open/close race in saa7134

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Date:	Sun, 22 Jun 2008 10:05:07 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	mchehab@...radead.org
Cc:	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>
Subject: [PATCH] Fix open/close race in saa7134


From: Arjan van de Ven <arjan@...ux.intel.com>
Date: Sun, 22 Jun 2008 10:03:02 -0700
Subject: [PATCH] Fix open/close race in saa7134

The saa7134 driver uses a (non-atomic) variable in an attempt to
only allow one opener of the device (how it deals with sending
the fd over unix sockets I don't know).

Unfortunately, the release function first decrements this variable,
and THEN goes on to disable more of the device. This allows for
a race where another opener of the device comes in after the decrement of
the variable, configures the hardware just to then see the hardware
be disabled by the rest of the release function.

This patch makes the release function use the same lock as the open
function to protect the hardware as well as the variable (which now
at least has some locking to protect it).

Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
---
 drivers/media/video/saa7134/saa7134-empress.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/media/video/saa7134/saa7134-empress.c b/drivers/media/video/saa7134/saa7134-empress.c
index 81431ee..9108843 100644
--- a/drivers/media/video/saa7134/saa7134-empress.c
+++ b/drivers/media/video/saa7134/saa7134-empress.c
@@ -110,6 +110,8 @@ static int ts_release(struct inode *inode, struct file *file)
 {
 	struct saa7134_dev *dev = file->private_data;
 
+	mutex_lock(&dev->empress_tsq.vb_lock);
+
 	videobuf_stop(&dev->empress_tsq);
 	videobuf_mmap_free(&dev->empress_tsq);
 	dev->empress_users--;
@@ -121,6 +123,8 @@ static int ts_release(struct inode *inode, struct file *file)
 	saa_writeb(SAA7134_AUDIO_MUTE_CTRL,
 		saa_readb(SAA7134_AUDIO_MUTE_CTRL) | (1 << 6));
 
+	mutex_unlock(&dev->empress_tsq.vb_lock);
+
 	return 0;
 }
 
-- 
1.5.5.1



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