linux-kernel - [PATCH 4.19 240/267] media: ov5640: fix use of destroyed mutex

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200619141700.208218465@linuxfoundation.org>
Date:   Fri, 19 Jun 2020 16:33:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tomi Valkeinen <tomi.valkeinen@...com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Benoit Parrot <bparrot@...com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: [PATCH 4.19 240/267] media: ov5640: fix use of destroyed mutex

From: Tomi Valkeinen <tomi.valkeinen@...com>

commit bfcba38d95a0aed146a958a84a2177af1459eddc upstream.

v4l2_ctrl_handler_free() uses hdl->lock, which in ov5640 driver is set
to sensor's own sensor->lock. In ov5640_remove(), the driver destroys the
sensor->lock first, and then calls v4l2_ctrl_handler_free(), resulting
in the use of the destroyed mutex.

Fix this by calling moving the mutex_destroy() to the end of the cleanup
sequence, as there's no need to destroy the mutex as early as possible.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: stable@...r.kernel.org # v4.14+
Reviewed-by: Benoit Parrot <bparrot@...com>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/i2c/ov5640.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -2829,8 +2829,8 @@ static int ov5640_probe(struct i2c_clien
 free_ctrls:
 	v4l2_ctrl_handler_free(&sensor->ctrls.handler);
 entity_cleanup:
-	mutex_destroy(&sensor->lock);
 	media_entity_cleanup(&sensor->sd.entity);
+	mutex_destroy(&sensor->lock);
 	return ret;
 }
 
@@ -2840,9 +2840,9 @@ static int ov5640_remove(struct i2c_clie
 	struct ov5640_dev *sensor = to_ov5640_dev(sd);
 
 	v4l2_async_unregister_subdev(&sensor->sd);
-	mutex_destroy(&sensor->lock);
 	media_entity_cleanup(&sensor->sd.entity);
 	v4l2_ctrl_handler_free(&sensor->ctrls.handler);
+	mutex_destroy(&sensor->lock);
 
 	return 0;
 }