linux-kernel - Re: [PATCH] staging: r8188eu: add check for kzalloc

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Message-ID: <20220518045406.GO29930@kadam>
Date:   Wed, 18 May 2022 07:54:07 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        gregkh@...uxfoundation.org, straube.linux@...il.com,
        fmdefrancesco@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8188eu: add check for kzalloc

On Wed, May 18, 2022 at 11:09:57AM +0800, Jiasheng Jiang wrote:
> As kzalloc may return null pointer, it should be better to
> check the return value in order to avoid dereference of
> null pointer.
> Moreover, the "padapter->xmitpriv.hwxmits" should also be
> checked and return _FAIL if it is null.
> 
> Fixes: 15865124feed ("staging: r8188eu: introduce new core dir for RTL8188eu driver")
> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/staging/r8188eu/core/rtw_xmit.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
> index c2a550e7250e..f47d2bf71a45 100644
> --- a/drivers/staging/r8188eu/core/rtw_xmit.c
> +++ b/drivers/staging/r8188eu/core/rtw_xmit.c
> @@ -179,6 +179,11 @@ s32	_rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
>  	pxmitpriv->free_xmit_extbuf_cnt = num_xmit_extbuf;
>  
>  	rtw_alloc_hwxmits(padapter);
> +	if (!padapter->xmitpriv.hwxmits) {
> +		res = _FAIL;
> +		goto exit;
> +	}

Please make rtw_alloc_hwxmits() return -ENOMEM on failure and zero on
success.

regards,
dan carpenter