linux-kernel - Re: [PATCH] mfd: cros_ec: Fix possible leak in led_rgb

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Date:	Mon, 20 Jul 2015 07:50:36 -0700
From:	Gwendal Grignou <gwendal@...omium.org>
To:	Christian Engelmayer <cengelma@....at>
Cc:	Olof Johansson <olof@...om.net>, Lee Jones <lee.jones@...aro.org>,
	Gwendal Grignou <gwendal@...omium.org>,
	Bill Richardson <wfrichar@...omium.org>,
	Stephen Barber <smbarber@...omium.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: cros_ec: Fix possible leak in led_rgb_store()

On Sun, Jul 19, 2015 at 12:43 PM, Christian Engelmayer <cengelma@....at> wrote:
> Function led_rgb_store() contains some direct returns in error cases that
> leak the already allocated cros_ec_command message structure. Make sure
> that 'msg' is freed in all exit paths. Detected by Coverity CID 1309666.
>
> Signed-off-by: Christian Engelmayer <cengelma@....at>
> ---
> Compile tested only. Applies against linux-next.
> ---
>  drivers/platform/chrome/cros_ec_lightbar.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
> index 144e09df9b84..4e598c11e8a4 100644
> --- a/drivers/platform/chrome/cros_ec_lightbar.c
> +++ b/drivers/platform/chrome/cros_ec_lightbar.c
> @@ -252,7 +252,7 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
>
>                 ret = sscanf(buf, "%i", &val[i++]);
>                 if (ret == 0)
> -                       return -EINVAL;
> +                       goto exit;
>
>                 if (i == 4) {
>                         param = (struct ec_params_lightbar *)msg->data;
> @@ -268,17 +268,15 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
>                         if ((j++ % 4) == 0) {
>                                 ret = lb_throttle();
>                                 if (ret)
> -                                       return ret;
> +                                       goto exit;
>                         }
>
>                         ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
>                         if (ret < 0)
>                                 goto exit;
>
> -                       if (msg->result != EC_RES_SUCCESS) {
> -                               ret = -EINVAL;
ret = -EINVAL is necessary to indicate the command did not succeed:
the command was successfully sent to the EC, and the response was
received, but the EC failed the command internally.
> +                       if (msg->result != EC_RES_SUCCESS)
>                                 goto exit;
> -                       }
>
>                         i = 0;
>                         ok = 1;
> --
> 1.9.1
>
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