[PATCH 1/3] wifi: iwlwifi: mvm: defer freeing PTK PN state on key failure

[Zhao Li]

The PTK packet-number state is published to RCU readers before the key is
installed in firmware.

If firmware rejects the key, the error path clears the pointer and
immediately frees the state while an RX reader may still hold it.

Defer the free until after an RCU grace period, matching the normal key
removal path.

Fixes: d066a530af8e ("wifi: iwlwifi: mvm: fix ptk_pn memory leak")
Cc: stable@xxxxxxxxxxxxxxx
Assisted-by: Codex:gpt-6-astra
Signed-off-by: Zhao Li <enderaoelyther@xxxxxxxxx>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 5bd246e37943..b0c4f245c88f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -4385,7 +4385,7 @@ static int __iwl_mvm_mac_set_key(struct ieee80211_hw *hw,
 			key->hw_key_idx = STA_KEY_IDX_INVALID;
 			if (ptk_pn) {
 				RCU_INIT_POINTER(mvmsta->ptk_pn[keyidx], NULL);
-				kfree(ptk_pn);
+				kfree_rcu(ptk_pn, rcu_head);
 			}
 			/*
 			 * can't add key for RX, but we don't need it
-- 
2.55.0