linux-kernel - [PATCH 2/6] staging: rtl8188eu: use safe iterator in rtw_free_all

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Message-Id: <20210516160613.30489-2-martin@kaiser.cx>
Date:   Sun, 16 May 2021 18:06:09 +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 2/6] staging: rtl8188eu: use safe iterator in rtw_free_all_stainfo

This is another case where we may remove list entries while we iterate over
the list. Use list_for_each_safe to avoid an endless loop.

Fixes: 23017c8842d2 ("staging: rtl8188eu: Use list iterators and helpers")
Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
Without this patch, unloading the module goes into an endless loop
sometimes.

 drivers/staging/rtl8188eu/core/rtw_sta_mgt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c b/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c
index 7941ca0397ed..eda7a441acde 100644
--- a/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c
+++ b/drivers/staging/rtl8188eu/core/rtw_sta_mgt.c
@@ -379,7 +379,7 @@ u32 rtw_free_stainfo(struct adapter *padapter, struct sta_info *psta)
 /*  free all stainfo which in sta_hash[all] */
 void rtw_free_all_stainfo(struct adapter *padapter)
 {
-	struct list_head *plist, *phead;
+	struct list_head *plist, *phead, *temp;
 	s32 index;
 	struct sta_info *psta = NULL;
 	struct sta_priv *pstapriv = &padapter->stapriv;
@@ -392,7 +392,7 @@ void rtw_free_all_stainfo(struct adapter *padapter)
 
 	for (index = 0; index < NUM_STA; index++) {
 		phead = &pstapriv->sta_hash[index];
-		list_for_each(plist, phead) {
+		list_for_each_safe(plist, temp, phead) {
 			psta = list_entry(plist, struct sta_info, hash_list);
 
 			if (pbcmc_stainfo != psta)
-- 
2.20.1