linux-kernel - Re: [syzbot] [wireless?] KASAN: slab-use-after-free Read in cmp

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Message-ID: <tencent_9292DCC668099DAEC36EDE0CA4A7EE46DB06@qq.com>
Date: Tue, 12 Aug 2025 09:16:44 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+30754ca335e6fb7e3092@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] KASAN: slab-use-after-free Read in cmp_bss

#syz test

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index a8339ed52404..dcf7cfb9ba6b 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1917,6 +1917,7 @@ cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
 
 			f = rcu_access_pointer(new->pub.beacon_ies);
 			kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
+			RCU_INIT_POINTER(new->pub.beacon_ies, NULL);
 			return false;
 		}