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mac80211: rx: avoid RCU list traversal under mutex 

[ Upstream commit 253216ffb2 ]

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@gmail.com>
Link: https://lore.kernel.org/r/20200223143302.15390-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Madhuparna Bhowmik 2020-02-23 20:03:02 +05:30 committed by Greg Kroah-Hartman
parent 5d92d834aa
commit a342bb7b99
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/rx.c
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@ -4114,7 +4114,7 @@ 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;