RTE Timer Adapter Use After Free

https://bugs.dpdk.org/show_bug.cgi?id=189

            Bug ID: 189
           Summary: RTE Timer Adapter Use After Free
           Product: DPDK
           Version: 19.02
          Hardware: All
                OS: All
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: eventdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

Upon event timer expiry, the timer adapter will cause the timer struct to be used after its freed.

rte_event_timer_adapter.c:sw_event_timer_cb() calls rte_mempool_put(), returning the internal timer-related data, including a rte_timer instance, to the pool.

rte_timer_manage() updates fields of the rte_timer struct *after* the expiry call back has finished.

Timers armed on a different core may retrieve this timer struct from the pool, resulting in a data race.

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