net: ena: ena-com.c: prevent NULL pointer dereference

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[ Upstream commit c207979f5a ]

comp_ctx can be NULL in a very rare case when an admin command is executed
during the execution of ena_remove().

The bug scenario is as follows:

* ena_destroy_device() sets the comp_ctx to be NULL
* An admin command is executed before executing unregister_netdev(),
  this can still happen because our device can still receive callbacks
  from the netdev infrastructure such as ethtool commands.
* When attempting to access the comp_ctx, the bug occurs since it's set
  to NULL

Fix:
Added a check that comp_ctx is not NULL

Fixes: 1738cd3ed3 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Arthur Kiyanovski 2020-02-11 15:17:51 +00:00 • committed by Greg Kroah-Hartman

parent 1f018b12db

commit 03a29f3d44

1 changed files with 5 additions and 0 deletions

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drivers/net/ethernet/amazon/ena/ena_com.c

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