linux-kernel - Re: [syzbot] [wireless?] WARNING: suspicious RCU usage in __cfg80211_bss

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Date: Wed,  3 Jan 2024 19:33:46 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+864a269c27ee06b58374@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [wireless?] WARNING: suspicious RCU usage in __cfg80211_bss_update

please test WARNING: suspicious RCU usage in __cfg80211_bss_update

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git 954fb2d2d49f

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index cf2131671eb6..7cb8ae87c369 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1864,7 +1864,7 @@ __cfg80211_bss_update(struct cfg80211_registered_device *rdev,
 					 &hidden->hidden_list);
 				hidden->refcount++;
 
-				ies = (void *)rcu_dereference(new->pub.beacon_ies);
+				ies = (void *)rcu_access_pointer(new->pub.beacon_ies);
 				rcu_assign_pointer(new->pub.beacon_ies,
 						   hidden->pub.beacon_ies);
 				if (ies)