iwlwifi: pcie: don't crash on invalid RX interrupt

[ Upstream commit 30f24eabab8cd801064c5c37589d803cb4341929 ] If for some reason the device gives us an RX interrupt before we're ready for it, perhaps during device power-on with misconfigured IRQ causes mapping or so, we can crash trying to access the queues. Prevent that by checking that we actually have RXQs and that they were properly allocated. Signed-off-by: Johannes Berg <[email protected]> Signed-off-by: Luca Coelho <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
LesGaR · May 31, 2019 · 06b4769 · 06b4769
1 parent 72c8b10
commit 06b4769
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
@@ -1252,10 +1252,15 @@ static void iwl_pcie_rx_handle_rb(struct iwl_trans *trans,
 static void iwl_pcie_rx_handle(struct iwl_trans *trans, int queue)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-	struct iwl_rxq *rxq = &trans_pcie->rxq[queue];
+	struct iwl_rxq *rxq;
 	u32 r, i, count = 0;
 	bool emergency = false;
 
+	if (WARN_ON_ONCE(!trans_pcie->rxq || !trans_pcie->rxq[queue].bd))
+		return;
+
+	rxq = &trans_pcie->rxq[queue];
+
 restart:
 	spin_lock(&rxq->lock);
 	/* uCode's read index (stored in shared DRAM) indicates the last Rx