Messages in this thread | | | Subject | Re: [PATCH] mt76: hold RCU lock when calling ieee80211_find_sta_by_ifaddr() | From | Felix Fietkau <> | Date | Fri, 12 Feb 2021 06:36:26 +0100 |
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On 2021-02-12 03:13, Shuah Khan wrote: > ieee80211_find_sta_by_ifaddr() must be called under the RCU lock and > the resulting pointer is only valid under RCU lock as well. > > Fix mt76_check_sta() to hold RCU read lock before it calls > ieee80211_find_sta_by_ifaddr() and release it when the resulting > pointer is no longer needed. > > This problem was found while reviewing code to debug RCU warn from > ath10k_wmi_tlv_parse_peer_stats_info() and a subsequent manual audit > of other callers of ieee80211_find_sta_by_ifaddr() that don't hold > RCU read lock. > > Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> If I'm not mistaken, this patch is unnecessary. mt76_check_sta is only called from mt76_rx_poll_complete, which itself is only called under RCU lock.
- Felix
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