[PATCH for v5.16] iwlwifi: mvm: don't crash on invalid rate w/o STA
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STALE1769d
LANDED
From: Luca Coelho <hidden>
Date: 2021-12-03 12:04:36
Subsystem:
intel wireless wifi link (iwlwifi), the rest · Maintainers:
Miri Korenblit, Linus Torvalds
Landed in mainline as d599f714b73e on 2021-12-08.
From: Johannes Berg <redacted>
If we get to the WARN_ONCE(..., "Got a HT rate (...)", ...)
here with a NULL sta, then we crash because mvmsta is bad
and we try to dereference it. Fix that by printing -1 as the
state if no station was given.
Signed-off-by: Johannes Berg <redacted>
Fixes: 6761a718263a ("iwlwifi: mvm: add explicit check for non-data frames in get Tx rate")
Signed-off-by: Luca Coelho <redacted>
---
drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index bdd4ee432548..76e0b7b45980 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c@@ -269,17 +269,18 @@ static u32 iwl_mvm_get_tx_rate(struct iwl_mvm *mvm, u8 rate_plcp; u32 rate_flags = 0; bool is_cck; - struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); /* info->control is only relevant for non HW rate control */ if (!ieee80211_hw_check(mvm->hw, HAS_RATE_CONTROL)) { + struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta); + /* HT rate doesn't make sense for a non data frame */ WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS && !ieee80211_is_data(fc), "Got a HT rate (flags:0x%x/mcs:%d/fc:0x%x/state:%d) for a non data frame\n", info->control.rates[0].flags, info->control.rates[0].idx, - le16_to_cpu(fc), mvmsta->sta_state); + le16_to_cpu(fc), sta ? mvmsta->sta_state : -1); rate_idx = info->control.rates[0].idx; }
--
2.33.1