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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>
This commit is contained in:
Davide Caratti 2018-10-20 23:33:08 +02:00 committed by David S. Miller
parent 9469f375ab
commit c08f5ed5d6
1 changed files with 10 additions and 2 deletions
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12
net/sched/act_police.c
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@ -185,8 +185,6 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
new->peak_present = false;
}
if (tb[TCA_POLICE_RESULT])
new->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
new->tcfp_burst = PSCHED_TICKS2NS(parm->burst);
new->tcfp_toks = new->tcfp_burst;
if (new->peak_present) {
@ -198,6 +196,16 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
if (tb[TCA_POLICE_AVRATE])
new->tcfp_ewma_rate = nla_get_u32(tb[TCA_POLICE_AVRATE]);
if (tb[TCA_POLICE_RESULT]) {
new->tcfp_result = nla_get_u32(tb[TCA_POLICE_RESULT]);
if (TC_ACT_EXT_CMP(new->tcfp_result, TC_ACT_GOTO_CHAIN)) {
NL_SET_ERR_MSG(extack,
"goto chain not allowed on fallback");
err = -EINVAL;
goto failure;
}
}
spin_lock_bh(&police->tcf_lock);
new->tcfp_t_c = ktime_get_ns();
police->tcf_action = parm->action;