Re: [PATCH] staging: r8188eu: add a null check of kzalloc in go_add_group_info_attr

[Dan Carpenter <error27@gmail.com>]

On Sun, Feb 26, 2023 at 09:25:00PM +0800, Kang Chen wrote:
> kzalloc may fails, pdata_attr might be null and will cause
> illegal address access later.
> 
> Signed-off-by: Kang Chen <void0red@gmail.com>
> ---
>  drivers/staging/r8188eu/core/rtw_p2p.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/staging/r8188eu/core/rtw_p2p.c b/drivers/staging/r8188eu/core/rtw_p2p.c
> index 93d3c9c43..802e1170a 100644
> --- a/drivers/staging/r8188eu/core/rtw_p2p.c
> +++ b/drivers/staging/r8188eu/core/rtw_p2p.c
> @@ -31,6 +31,8 @@ static u32 go_add_group_info_attr(struct wifidirect_info *pwdinfo, u8 *pbuf)
>  	struct sta_priv *pstapriv = &padapter->stapriv;
>  
>  	pdata_attr = kzalloc(MAX_P2P_IE_LEN, GFP_KERNEL);
> +	if (!pdata_attr)
> +		return 0;

Return success here is not a good thing.  We have to fix the caller to
check for errors.  (Fixing a bug half way just makes it harder to find
the bug so it makes the situation worse).

regards,
dan carpenter