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Message-Id: <20190504.005853.22857057952226160.davem@davemloft.net> Date: Sat, 04 May 2019 00:58:53 -0400 (EDT) From: David Miller <davem@...emloft.net> To: mcroce@...hat.com Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us, vladbu@...lanox.com Subject: Re: [PATCH net] cls_matchall: avoid panic when receiving a packet before filter set From: Matteo Croce <mcroce@...hat.com> Date: Thu, 2 May 2019 10:51:05 +0200 > 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> Applied and queued up for -stable, thanks.
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