net/ena: fix potential access to freed memory during device reset
authorNetanel Belgazal <netanel@annapurnalabs.com>
Thu, 9 Feb 2017 13:21:33 +0000 (15:21 +0200)
committerDavid S. Miller <davem@davemloft.net>
Fri, 10 Feb 2017 03:27:06 +0000 (22:27 -0500)
commit3f6159dbfc24c5e61fb5deb9b69e0abb934609bb
treef5abffa0b354b502a1dfad022001dc096a4ae5cf
parentd81db24056132fe8b83e2fba337e9ea76675e68d
net/ena: fix potential access to freed memory during device reset

If the ena driver detects that the device is not behave as expected,
it tries to reset the device.
The reset flow calls ena_down, which will frees all the resources
the driver allocates and then it will reset the device.

This flow can cause memory corruption if the device is still writes
to the driver's memory space.
To overcome this potential race, move the reset before the device
resources are freed.

Signed-off-by: Netanel Belgazal <netanel@annapurnalabs.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/amazon/ena/ena_netdev.c