CVE-2022-49149

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

rxrpc: Fix call timer start racing with call destruction

The rxrpc_call struct has a timer used to handle various timed events

relating to a call. This timer can get started from the packet input

routines that are run in softirq mode with just the RCU read lock held.

Unfortunately, because only the RCU read lock is held - and neither ref or

other lock is taken - the call can start getting destroyed at the same time

a packet comes in addressed to that call. This causes the timer - which

was already stopped - to get restarted. Later, the timer dispatch code may

then oops if the timer got deallocated first.

Fix this by trying to take a ref on the rxrpc_call struct and, if

successful, passing that ref along to the timer. If the timer was already

running, the ref is discarded.

The timer completion routine can then pass the ref along to the call's work

item when it queues it. If the timer or work item where already

queued/running, the extra ref is discarded.