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Message-Id: <20181102182909.764164751@linuxfoundation.org>
Date: Fri, 2 Nov 2018 19:34:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Arthur Kiyanovski <akiyano@...zon.com>,
"David S. Miller" <davem@...emloft.net>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.18 090/150] net: ena: fix NULL dereference due to untimely napi initialization
4.18-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit 78a55d05def95144ca5fa9a64c49b2a0636a9866 ]
napi poll functions should be initialized before running request_irq(),
to handle a rare condition where there is a pending interrupt, causing
the ISR to fire immediately while the poll function wasn't set yet,
causing a NULL dereference.
Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/ethernet/amazon/ena/ena_netdev.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 72dbdebf4b5d..000f0d42a710 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -1580,8 +1580,6 @@ static int ena_up_complete(struct ena_adapter *adapter)
if (rc)
return rc;
- ena_init_napi(adapter);
-
ena_change_mtu(adapter->netdev, adapter->netdev->mtu);
ena_refill_all_rx_bufs(adapter);
@@ -1735,6 +1733,13 @@ static int ena_up(struct ena_adapter *adapter)
ena_setup_io_intr(adapter);
+ /* napi poll functions should be initialized before running
+ * request_irq(), to handle a rare condition where there is a pending
+ * interrupt, causing the ISR to fire immediately while the poll
+ * function wasn't set yet, causing a null dereference
+ */
+ ena_init_napi(adapter);
+
rc = ena_request_io_irq(adapter);
if (rc)
goto err_req_irq;
--
2.17.1
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