linux-kernel - Re: [PATCH -next] staging: greybus: fix a missing-check bug in gb_lights_light

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Date:   Thu, 2 Apr 2020 15:22:28 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Chen Zhou <chenzhou10@...wei.com>
Cc:     rmfrfs@...il.com, johan@...nel.org, elder@...nel.org,
        gregkh@...uxfoundation.org, greybus-dev@...ts.linaro.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] staging: greybus: fix a missing-check bug in
 gb_lights_light_config()

On Wed, Apr 01, 2020 at 11:00:17AM +0800, Chen Zhou wrote:
> In gb_lights_light_config(), 'light->name' is allocated by kstrndup().
> It returns NULL when fails, add check for it.
> 
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> ---
>  drivers/staging/greybus/light.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c
> index d6ba25f..d2672b6 100644
> --- a/drivers/staging/greybus/light.c
> +++ b/drivers/staging/greybus/light.c
> @@ -1026,7 +1026,8 @@ static int gb_lights_light_config(struct gb_lights *glights, u8 id)
>  
>  	light->channels_count = conf.channel_count;
>  	light->name = kstrndup(conf.name, NAMES_MAX, GFP_KERNEL);
> -
> +	if (!light->name)
> +		return -ENOMEM;
>  	light->channels = kcalloc(light->channels_count,
>  				  sizeof(struct gb_channel), GFP_KERNEL);
>  	if (!light->channels)

The clean up in this function is non-existant.  :(

regards,
dan carpenter