[PATCH 3.10 07/53] iwlwifi: mvm: validate tid and sta_id in ba_notif

[Greg Kroah-Hartman]

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eyal Shapira <eyal@xxxxxxxxxx>

commit 2cee4762c528a9bd2cdff793197bf591a2196c11 upstream.

These are coming from the FW and are used to access arrays.
Bad values can cause an out of bounds access so discard
such ba_notifs and warn.

Signed-off-by: Eyal Shapira <eyalx.shapira@xxxxxxxxx>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/net/wireless/iwlwifi/mvm/tx.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -832,6 +832,11 @@ int iwl_mvm_rx_ba_notif(struct iwl_mvm *
 	sta_id = ba_notif->sta_id;
 	tid = ba_notif->tid;
 
+	if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
+		      tid >= IWL_MAX_TID_COUNT,
+		      "sta_id %d tid %d", sta_id, tid))
+		return 0;
+
 	rcu_read_lock();
 
 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);


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