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

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Message-Id: <20210516160613.30489-3-martin@kaiser.cx>
Date:   Sun, 16 May 2021 18:06:10 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-staging@...ts.linux.dev, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH 3/6] staging: rtl8188eu: use safe iterator in expire_timeout_chk

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>
---
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