[PATCH AUTOSEL 6.6 13/22] wifi: iwlwifi: mvm: guard against invalid STA ID on removal

[Sasha Levin]

From: Benjamin Berg <benjamin.berg@xxxxxxxxx>

[ Upstream commit 17f64517bf5c26af56b6c3566273aad6646c3c4f ]

Guard against invalid station IDs in iwl_mvm_mld_rm_sta_id as that would
result in out-of-bounds array accesses. This prevents issues should the
driver get into a bad state during error handling.

Signed-off-by: Benjamin Berg <benjamin.berg@xxxxxxxxx>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@xxxxxxxxx>
Link: https://msgid.link/20240320232419.d523167bda9c.I1cffd86363805bf86a95d8bdfd4b438bb54baddc@changeid
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c b/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
index 1ccbe8c1eeb42..278454c116fee 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
@@ -853,10 +853,15 @@ int iwl_mvm_mld_rm_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 
 int iwl_mvm_mld_rm_sta_id(struct iwl_mvm *mvm, u8 sta_id)
 {
-	int ret = iwl_mvm_mld_rm_sta_from_fw(mvm, sta_id);
+	int ret;
 
 	lockdep_assert_held(&mvm->mutex);
 
+	if (WARN_ON(sta_id == IWL_MVM_INVALID_STA))
+		return 0;
+
+	ret = iwl_mvm_mld_rm_sta_from_fw(mvm, sta_id);
+
 	RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id], NULL);
 	RCU_INIT_POINTER(mvm->fw_id_to_link_sta[sta_id], NULL);
 	return ret;
-- 
2.43.0