Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Takashi Iwai <tiwai@suse.de>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>
Cc:     Hyunwoo Kim <imv4bel@gmail.com>, linux-media@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH] media: dvb-core: Fix UAF due to refcount races at releasing
Date:   Thu,  8 Sep 2022 15:27:54 +0200
Message-Id: <20220908132754.30532-1-tiwai@suse.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The dvb-core tries to sync the releases of opened files at
dvb_dmxdev_release() with two refcounts: dvbdev->users and
dvr_dvbdev->users.  A problem is present in those two syncs: when yet
another dvb_demux_open() is called during those sync waits,
dvb_demux_open() continues to process even if the device is being
closed.  This includes the increment of the former refcount, resulting
in the leftover refcount after the sync of the latter refcount at
dvb_dmxdev_release().  It ends up with use-after-free, since the
function believes that all usages were gone and releases the
resources.

This patch addresses the problem by adding the check of dmxdev->exit
flag at dvb_demux_open(), just like dvb_dvr_open() already does.  With
the exit flag check, the second call of dvb_demux_open() fails, hence
the further corruption can be avoided.

Also for avoiding the races of the dmxdev->exit flag reference, this
patch serializes the dmxdev->exit set up and the sync waits with the
dmxdev->mutex lock at dvb_dmxdev_release().  Without the mutex lock,
dvb_demux_open() (or dvb_dvr_open()) may run concurrently with
dvb_dmxdev_release(), which allows to skip the exit flag check and
continue the open process that is being closed.

Reported-by: Hyunwoo Kim <imv4bel@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/media/dvb-core/dmxdev.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
index f6ee678107d3..9ce5f010de3f 100644
--- a/drivers/media/dvb-core/dmxdev.c
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -790,6 +790,11 @@ static int dvb_demux_open(struct inode *inode, struct file *file)
 	if (mutex_lock_interruptible(&dmxdev->mutex))
 		return -ERESTARTSYS;
 
+	if (dmxdev->exit) {
+		mutex_unlock(&dmxdev->mutex);
+		return -ENODEV;
+	}
+
 	for (i = 0; i < dmxdev->filternum; i++)
 		if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
 			break;
@@ -1448,7 +1453,10 @@ EXPORT_SYMBOL(dvb_dmxdev_init);
 
 void dvb_dmxdev_release(struct dmxdev *dmxdev)
 {
+	mutex_lock(&dmxdev->mutex);
 	dmxdev->exit = 1;
+	mutex_unlock(&dmxdev->mutex);
+
 	if (dmxdev->dvbdev->users > 1) {
 		wait_event(dmxdev->dvbdev->wait_queue,
 				dmxdev->dvbdev->users == 1);
-- 
2.35.3