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wifi: iwlwifi: mvm: Add locking to the rate read flow

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[ Upstream commit a8938bc881d2a03f9b77f19fae924fe798a01285 ]

The rs_drv_get_rate flow reads the lq_sta to return the optimal rate
for tx frames. This read flow is not protected thereby leaving
a small window, a few instructions wide, open to contention by an
asynchronous rate update. Indeed this race condition was hit and the
update occurred in the middle of the read.

Fix this by locking the lq_sta struct during read.

Signed-off-by: Ariel Malamud <ariel.malamud@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230514120631.b52c9ed5c379.I15290b78e0d966c1b68278263776ca9de841d5fe@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ariel Malamud 2023-05-14 12:15:55 +03:00 committed by Greg Kroah-Hartman
parent 788f129f63
commit 7402fb48ef
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/intel/iwlwifi/mvm/rs.c
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@ -2692,6 +2692,8 @@ static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
return;
lq_sta = mvm_sta;
spin_lock(&lq_sta->pers.lock);
iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
info->band, &info->control.rates[0]);
info->control.rates[0].count = 1;
@ -2706,6 +2708,7 @@ static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
&txrc->reported_rate);
}
spin_unlock(&lq_sta->pers.lock);
}
static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,