Thu, Dec 21, 2017 at 08:26:24AM CET, xiyou.wangc...@gmail.com wrote:
>The rcu_barrier_bh() in mini_qdisc_pair_swap() is to wait for
>flying RCU callback installed by a previous mini_qdisc_pair_swap(),
>however we miss it on the tp_head==NULL path, which leads to that
>the RCU callback still uses miniq_old->rcu after it is freed together
>with qdisc in qdisc_graft(). So just add it on that path too.
>
>Fixes: 46209401f8f6 ("net: core: introduce mini_Qdisc and eliminate usage of
>tp->q for clsact fastpath ")
>Reported-by: Jakub Kicinski <jakub.kicin...@netronome.com>
>Tested-by: Jakub Kicinski <jakub.kicin...@netronome.com>
>Cc: Jiri Pirko <j...@mellanox.com>
>Cc: John Fastabend <john.fastab...@gmail.com>
>Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
Acked-by: Jiri Pirko <j...@mellanox.com>
