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Message-ID: <CAM_iQpWu5e+0KRhPPJ_p+bnOp9RHk81uTXp21ue4QpC4wZ6J4A@mail.gmail.com> Date: Thu, 2 May 2019 09:31:21 -0700 From: Cong Wang <xiyou.wangcong@...il.com> To: Matteo Croce <mcroce@...hat.com> Cc: Linux Kernel Network Developers <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Jamal Hadi Salim <jhs@...atatu.com>, Jiri Pirko <jiri@...nulli.us>, "David S. Miller" <davem@...emloft.net>, Vlad Buslov <vladbu@...lanox.com> Subject: Re: [PATCH net] cls_matchall: avoid panic when receiving a packet before filter set On Thu, May 2, 2019 at 1:51 AM Matteo Croce <mcroce@...hat.com> wrote: > > When a matchall classifier is added, there is a small time interval in > which tp->root is NULL. If we receive a packet in this small time slice > a NULL pointer dereference will happen, leading to a kernel panic: ... > Fix this by adding a NULL check in mall_classify(). > > Fixes: ed76f5edccc9 ("net: sched: protect filter_chain list with filter_chain_lock mutex") > Signed-off-by: Matteo Croce <mcroce@...hat.com> Acked-by: Cong Wang <xiyou.wangcong@...il.com> Thanks for the update!
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