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Change History

In the Linux kernel, the following vulnerability has been resolved:

net: shaper: protect late read accesses to the hierarchy

We look up a netdev during prep of Netlink ops (pre- callbacks)
and take a ref to it. Then later in the body of the callback
we take its lock or RCU which are the actual protections.

This is not proper, a conversion from a ref to a locked netdev
must include a liveness check (a check if the netdev hasn't been
unregistered already). Fix the read cases (those under RCU).
Writes needs a separate change to protect from creating the
hierarchy after flush has already run.

https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6

https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0

https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583