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net: ena: fix NULL dereference due to untimely napi initialization 

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: 1738cd3ed3 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arthur Kiyanovski 2018-10-09 11:21:29 +03:00 committed by David S. Miller
parent d7703ddbd7
commit 78a55d05de
1 changed files with 7 additions and 2 deletions
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9
drivers/net/ethernet/amazon/ena/ena_netdev.c
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@ -1575,8 +1575,6 @@ 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);
@ -1730,6 +1728,13 @@ 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;