linux-kernel - Re: [PATCH 3/6] staging: rtl8188eu: use safe iterator in expire_timeout

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Message-ID: <20210516192430.GC2126643@roeck-us.net>
Date:   Sun, 16 May 2021 12:24:30 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Martin Kaiser <martin@...ser.cx>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] staging: rtl8188eu: use safe iterator in
 expire_timeout_chk

On Sun, May 16, 2021 at 06:06:10PM +0200, Martin Kaiser wrote:
> In the first loop in expire_timeout_chk, we may call rtw_free_stainfo and
> remove an entry from auth_list.
> 
> In the second loop, we may call list_del_init on our list.
> 
> Use list_for_each_safe for both loops.
> 
> Fixes: 23017c8842d2 ("staging: rtl8188eu: Use list iterators and helpers")
> Signed-off-by: Martin Kaiser <martin@...ser.cx>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> compile-tested only
> 
>  drivers/staging/rtl8188eu/core/rtw_ap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/rtl8188eu/core/rtw_ap.c b/drivers/staging/rtl8188eu/core/rtw_ap.c
> index ca9a321c4921..a410b42ecb6e 100644
> --- a/drivers/staging/rtl8188eu/core/rtw_ap.c
> +++ b/drivers/staging/rtl8188eu/core/rtw_ap.c
> @@ -164,7 +164,7 @@ static u8 chk_sta_is_alive(struct sta_info *psta)
>  
>  void expire_timeout_chk(struct adapter *padapter)
>  {
> -	struct list_head *phead, *plist;
> +	struct list_head *phead, *plist, *temp;
>  	u8 updated = 0;
>  	struct sta_info *psta = NULL;
>  	struct sta_priv *pstapriv = &padapter->stapriv;
> @@ -176,7 +176,7 @@ void expire_timeout_chk(struct adapter *padapter)
>  
>  	phead = &pstapriv->auth_list;
>  	/* check auth_queue */
> -	list_for_each(plist, phead) {
> +	list_for_each_safe(plist, temp, phead) {
>  		psta = list_entry(plist, struct sta_info, auth_list);
>  
>  		if (psta->expire_to > 0) {
> -- 
> 2.20.1
>