linux-kernel - [PATCH] mac80211: Reject zero MAC address in sta_info_insert

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Message-ID: <20210626103856.19816-1-yuehaibing@huawei.com>
Date:   Sat, 26 Jun 2021 18:38:56 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <johannes@...solutions.net>, <davem@...emloft.net>,
        <kuba@...nel.org>, <periyasa@...eaurora.org>
CC:     <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH] mac80211: Reject zero MAC address in sta_info_insert_check()

As commit 52dba8d7d5ab ("mac80211: reject zero MAC address in add station")
said, we don't consider all-zeroes to be a valid MAC address in most places,
so also reject it here.

Reported-by: syzbot+ef4ca92d9d6f5ba2f880@...kaller.appspotmail.com
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 net/mac80211/sta_info.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index f2fb69da9b6e..3a6887fc9160 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -547,7 +547,7 @@ static int sta_info_insert_check(struct sta_info *sta)
 		return -ENETDOWN;
 
 	if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
-		    is_multicast_ether_addr(sta->sta.addr)))
+		    is_valid_ether_addr(sta->sta.addr)))
 		return -EINVAL;
 
 	/* The RCU read lock is required by rhashtable due to
-- 
2.17.1