From: Davide Caratti <dcaratti@redhat.com>
Date: Sat, 20 Oct 2018 21:33:08 +0000 (+0200)
Subject: net/sched: act_police: disallow 'goto chain' on fallback control action
X-Git-Tag: v4.20-rc1~151^2~18^2~2
X-Git-Url: https://git.codelabs.ch/?p=muen%2Flinux.git;a=commitdiff_plain;h=c08f5ed5d625926f38552b734b587a28e947b55c;hp=c08f5ed5d625926f38552b734b587a28e947b55c

net/sched: act_police: disallow 'goto chain' on fallback control action

in the following command:

 # tc action add action police rate <r> burst <b> conform-exceed <c1>/<c2>

'goto chain x' is allowed only for c1: setting it for c2 makes the kernel
crash with NULL pointer dereference, since TC core doesn't initialize the
chain handle.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---