linux-kernel - [PATCH AUTOSEL 5.1 075/219] media: uvcvideo: Fix access to uninitialized fields on probe error

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Date:   Mon, 15 Jul 2019 10:01:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Oliver Neukum <oneukum@...e.com>,
        syzbot+2e1ef9188251d9cc7944@...kaller.appspotmail.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Sasha Levin <sashal@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.1 075/219] media: uvcvideo: Fix access to uninitialized fields on probe error

From: Oliver Neukum <oneukum@...e.com>

[ Upstream commit 11a087f484bf15ff65f0a9f277aa5a61fd07ed2a ]

We need to check whether this work we are canceling actually is
initialized.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Reported-by: syzbot+2e1ef9188251d9cc7944@...kaller.appspotmail.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 14cff91b7aea..aa021498036a 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2350,7 +2350,9 @@ void uvc_ctrl_cleanup_device(struct uvc_device *dev)
 	struct uvc_entity *entity;
 	unsigned int i;
 
-	cancel_work_sync(&dev->async_ctrl.work);
+	/* Can be uninitialized if we are aborting on probe error. */
+	if (dev->async_ctrl.work.func)
+		cancel_work_sync(&dev->async_ctrl.work);
 
 	/* Free controls and control mappings for all entities. */
 	list_for_each_entry(entity, &dev->entities, list) {
-- 
2.20.1