Re: [syzbot] [wireless?] WARNING: suspicious RCU usage in __cfg80211_bss_update

[Edward Adam Davis]

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)