net/sched: act_gact: disallow 'goto chain' on fallback control action
in the following command: # tc action add action <c1> random <rand_type> <c2> <rand_param> '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: NDavide Caratti <dcaratti@redhat.com> Acked-by: NCong Wang <xiyou.wangcong@gmail.com> Acked-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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