linux-kernel - Re: [PATCH] staging: r8188eu: use kzalloc instead of kmalloc and memset

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Message-ID: <20211013094227.GJ8429@kadam>
Date:   Wed, 13 Oct 2021 12:42:27 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Wan Jiabing <wanjiabing@...o.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>,
        Martin Kaiser <martin@...ser.cx>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kael_w@...h.net
Subject: Re: [PATCH] staging: r8188eu: use kzalloc instead of kmalloc and
 memset

On Wed, Oct 13, 2021 at 03:01:28AM -0400, Wan Jiabing wrote:
> Fix following coccicheck warning:
> ./drivers/staging/r8188eu/os_dep/ioctl_linux.c:422:10-17:
> WARNING: kzalloc should be used for pwep, instead of kmalloc/memset
> 
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
> ---
>  drivers/staging/r8188eu/os_dep/ioctl_linux.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> index 0201f6fbeb25..51f46696a593 100644
> --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> @@ -419,11 +419,10 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param,
>  		if (wep_key_len > 0) {
>  			wep_key_len = wep_key_len <= 5 ? 5 : 13;
>  			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, KeyMaterial);
> -			pwep = kmalloc(wep_total_len, GFP_KERNEL);
> +			pwep = kzalloc(wep_total_len, GFP_KERNEL);
>  			if (!pwep)
>  				goto exit;

Not related to your patch, but this is missing an error code as well.
It should be:

	if (!pwep) {
		ret = -ENOMEM;
		goto exit;
	}

regards,
dan carpenter