net: macvlan: fix potential UAF problem for lowerdev

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Add the reference operation to lowerdev of macvlan to avoid
the potential UAF problem under the following known scenario:

Someone module puts the NETDEV_UNREGISTER event handler to a
work, and lowerdev is accessed in the work handler. But when
the work is excuted, lowerdev has been destroyed because upper
macvlan did not get reference to lowerdev correctly.

That likes as the scenario occurred by
commit 563bcbae3b ("net: vlan: fix a UAF in vlan_dev_real_dev()").

Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

This commit is contained in:

Ziyang Xuan 2022-03-11 17:03:26 +08:00 • committed by David S. Miller

parent de29aff976

commit 291ac68478

1 changed files with 13 additions and 1 deletions

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14

drivers/net/macvlan.c

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