From: Arthur Kiyanovski Date: Tue, 9 Oct 2018 08:21:29 +0000 (+0300) Subject: net: ena: fix NULL dereference due to untimely napi initialization X-Git-Tag: v4.9.136~43 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7bdb3af6a9538de3bc04939adc952347062c6a0e;p=platform%2Fkernel%2Flinux-amlogic.git net: ena: fix NULL dereference due to untimely napi initialization [ 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 Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index 1d92e034febc..0c298878bf46 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -1482,8 +1482,6 @@ 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); @@ -1643,6 +1641,13 @@ 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;