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SubjectRe: [PATCH] dvb-usb: Add memory free on error path in dw2102_probe()
For me it's fine.

Reviewed-By: Enrico Mioso <mrkiko.rs@gmail.com>

On Thu, 10 Aug 2017, Anton Vasilyev wrote:

> Date: Thu, 10 Aug 2017 17:27:44
> From: Anton Vasilyev <vasilyev@ispras.ru>
> To: Mauro Carvalho Chehab <mchehab@kernel.org>
> Cc: Anton Vasilyev <vasilyev@ispras.ru>, Jonathan McDowell <noodles@earth.li>,
> Alyssa Milburn <amilburn@zall.org>, Enrico Mioso <mrkiko.rs@gmail.com>,
> linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
> ldv-project@linuxtesting.org
> Subject: [PATCH] dvb-usb: Add memory free on error path in dw2102_probe()
>
> If dw2102_probe() fails on dvb_usb_device_init(), then memleak occurs.
>
> The patch adds deallocation to the error path.
>
> Found by Linux Driver Verification project (linuxtesting.org).
>
> Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
> ---
> drivers/media/usb/dvb-usb/dw2102.c | 39 +++++++++++++++++++++-----------------
> 1 file changed, 22 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c
> index 6e654e5..0d63693 100644
> --- a/drivers/media/usb/dvb-usb/dw2102.c
> +++ b/drivers/media/usb/dvb-usb/dw2102.c
> @@ -2332,10 +2332,12 @@ static struct dvb_usb_device_properties tt_s2_4600_properties = {
> static int dw2102_probe(struct usb_interface *intf,
> const struct usb_device_id *id)
> {
> + int retval = -ENOMEM;
> p1100 = kmemdup(&s6x0_properties,
> sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
> if (!p1100)
> - return -ENOMEM;
> + goto err0;
> +
> /* copy default structure */
> /* fill only different fields */
> p1100->firmware = P1100_FIRMWARE;
> @@ -2346,10 +2348,9 @@ static int dw2102_probe(struct usb_interface *intf,
>
> s660 = kmemdup(&s6x0_properties,
> sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
> - if (!s660) {
> - kfree(p1100);
> - return -ENOMEM;
> - }
> + if (!s660)
> + goto err1;
> +
> s660->firmware = S660_FIRMWARE;
> s660->num_device_descs = 3;
> s660->devices[0] = d660;
> @@ -2359,11 +2360,9 @@ static int dw2102_probe(struct usb_interface *intf,
>
> p7500 = kmemdup(&s6x0_properties,
> sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
> - if (!p7500) {
> - kfree(p1100);
> - kfree(s660);
> - return -ENOMEM;
> - }
> + if (!p7500)
> + goto err2;
> +
> p7500->firmware = P7500_FIRMWARE;
> p7500->devices[0] = d7500;
> p7500->rc.core.rc_query = prof_rc_query;
> @@ -2373,12 +2372,9 @@ static int dw2102_probe(struct usb_interface *intf,
>
> s421 = kmemdup(&su3000_properties,
> sizeof(struct dvb_usb_device_properties), GFP_KERNEL);
> - if (!s421) {
> - kfree(p1100);
> - kfree(s660);
> - kfree(p7500);
> - return -ENOMEM;
> - }
> + if (!s421)
> + goto err3;
> +
> s421->num_device_descs = 2;
> s421->devices[0] = d421;
> s421->devices[1] = d632;
> @@ -2408,7 +2404,16 @@ static int dw2102_probe(struct usb_interface *intf,
> THIS_MODULE, NULL, adapter_nr))
> return 0;
>
> - return -ENODEV;
> + retval = -ENODEV;
> + kfree(s421);
> +err3:
> + kfree(p7500);
> +err2:
> + kfree(s660);
> +err1:
> + kfree(p1100);
> +err0:
> + return retval;
> }
>
> static void dw2102_disconnect(struct usb_interface *intf)
> --
> 2.7.4
>
>

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