linux-kernel - [PATCH 4.19 17/48] mac80211: rx: avoid RCU list traversal under mutex

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Message-Id: <20200319123908.557931607@linuxfoundation.org>
Date:   Thu, 19 Mar 2020 14:03:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 17/48] mac80211: rx: avoid RCU list traversal under mutex

From: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>

[ Upstream commit 253216ffb2a002a682c6f68bd3adff5b98b71de8 ]

local->sta_mtx is held in __ieee80211_check_fast_rx_iface().
No need to use list_for_each_entry_rcu() as it also requires
a cond argument to avoid false lockdep warnings when not used in
RCU read-side section (with CONFIG_PROVE_RCU_LIST).
Therefore use list_for_each_entry();

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
Link: https://lore.kernel.org/r/20200223143302.15390-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/mac80211/rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 02d0b22d01141..c7c456c86b0d3 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4042,7 +4042,7 @@ void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
 
 	lockdep_assert_held(&local->sta_mtx);
 
-	list_for_each_entry_rcu(sta, &local->sta_list, list) {
+	list_for_each_entry(sta, &local->sta_list, list) {
 		if (sdata != sta->sdata &&
 		    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
 			continue;
-- 
2.20.1