linux-kernel - [PATCH] [media] mceusb: fix usbdev leak

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Date:	Tue,  9 Sep 2014 02:10:43 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Sean Young <sean@...s.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] [media] mceusb: fix usbdev leak

mceusb_init_rc_dev() does usb_get_dev(), but there is no any
usb_put_dev() in the driver.

The patch tries to straighten logic. It moves usb_get_dev()
directly to mceusb_dev_probe() and adds usb_put_dev() to an error path
and to mceusb_dev_disconnect().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/media/rc/mceusb.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
index 45b0894288e5..23e532da0cf7 100644
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -1198,10 +1198,9 @@ static void mceusb_flash_led(struct mceusb_dev *ir)
 	mce_async_out(ir, FLASH_LED, sizeof(FLASH_LED));
 }
 
-static struct rc_dev *mceusb_init_rc_dev(struct mceusb_dev *ir,
-					 struct usb_interface *intf)
+static struct rc_dev *mceusb_init_rc_dev(struct mceusb_dev *ir)
 {
-	struct usb_device *udev = usb_get_dev(interface_to_usbdev(intf));
+	struct usb_device *udev = ir->usbdev;
 	struct device *dev = ir->dev;
 	struct rc_dev *rc;
 	int ret;
@@ -1341,7 +1340,7 @@ static int mceusb_dev_probe(struct usb_interface *intf,
 	if (!ir->urb_in)
 		goto urb_in_alloc_fail;
 
-	ir->usbdev = dev;
+	ir->usbdev = usb_get_dev(dev);
 	ir->dev = &intf->dev;
 	ir->len_in = maxp;
 	ir->flags.microsoft_gen1 = is_microsoft_gen1;
@@ -1362,7 +1361,7 @@ static int mceusb_dev_probe(struct usb_interface *intf,
 		snprintf(name + strlen(name), sizeof(name) - strlen(name),
 			 " %s", buf);
 
-	ir->rc = mceusb_init_rc_dev(ir, intf);
+	ir->rc = mceusb_init_rc_dev(ir);
 	if (!ir->rc)
 		goto rc_dev_fail;
 
@@ -1408,6 +1407,7 @@ static int mceusb_dev_probe(struct usb_interface *intf,
 
 	/* Error-handling path */
 rc_dev_fail:
+	usb_put_dev(ir->usbdev);
 	usb_free_urb(ir->urb_in);
 urb_in_alloc_fail:
 	usb_free_coherent(dev, maxp, ir->buf_in, ir->dma_in);
@@ -1435,6 +1435,7 @@ static void mceusb_dev_disconnect(struct usb_interface *intf)
 	usb_kill_urb(ir->urb_in);
 	usb_free_urb(ir->urb_in);
 	usb_free_coherent(dev, ir->len_in, ir->buf_in, ir->dma_in);
+	usb_put_dev(dev);
 
 	kfree(ir);
 }
-- 
1.9.1

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