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net: sched: fix action overwrite reference counting

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Action init code increments reference counter when it changes an action.
This is the desired behavior for cls API which needs to obtain action
reference for every classifier that points to action. However, act API just
needs to change the action and releases the reference before returning.
This sequence breaks when the requested action doesn't exist, which causes
act API init code to create new action with specified index, but action is
still released before returning and is deleted (unless it was referenced
concurrently by cls API).

Reproduction:

$ sudo tc actions ls action gact
$ sudo tc actions change action gact drop index 1
$ sudo tc actions ls action gact

Extend tcf_action_init() to accept 'init_res' array and initialize it with
action->ops->init() result. In tcf_action_add() remove pointers to created
actions from actions array before passing it to tcf_action_put_many().

Fixes: cae422f379 ("net: sched: use reference counting action init")
Reported-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2021-04-07 18:36:03 +03:00 committed by David S. Miller
parent 4ba86128ba
commit 87c750e8c3
3 changed files with 23 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/act_api.h
View File

@ -185,7 +185,7 @@ int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
int nr_actions, struct tcf_result *res);
int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
struct nlattr *est, char *name, int ovr, int bind,
struct tc_action *actions[], size_t *attr_size,
struct tc_action *actions[], int init_res[], size_t *attr_size,
bool rtnl_held, struct netlink_ext_ack *extack);
struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
bool rtnl_held,
@ -193,7 +193,8 @@ struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
struct nlattr *nla, struct nlattr *est,
char *name, int ovr, int bind,
struct tc_action_ops *ops, bool rtnl_held,
struct tc_action_ops *a_o, int *init_res,
bool rtnl_held,
struct netlink_ext_ack *extack);
int tcf_action_dump(struct sk_buff *skb, struct tc_action *actions[], int bind,
int ref, bool terse);

20
net/sched/act_api.c
View File

@ -992,7 +992,8 @@ struct tc_action_ops *tc_action_load_ops(char *name, struct nlattr *nla,
struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
struct nlattr *nla, struct nlattr *est,
char *name, int ovr, int bind,
struct tc_action_ops *a_o, bool rtnl_held,
struct tc_action_ops *a_o, int *init_res,
bool rtnl_held,
struct netlink_ext_ack *extack)
{
struct nla_bitfield32 flags = { 0, 0 };
@ -1028,6 +1029,7 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
}
if (err < 0)
goto err_out;
*init_res = err;
if (!name && tb[TCA_ACT_COOKIE])
tcf_set_action_cookie(&a->act_cookie, cookie);
@ -1056,7 +1058,7 @@ err_out:
int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
struct nlattr *est, char *name, int ovr, int bind,
struct tc_action *actions[], size_t *attr_size,
struct tc_action *actions[], int init_res[], size_t *attr_size,
bool rtnl_held, struct netlink_ext_ack *extack)
{
struct tc_action_ops *ops[TCA_ACT_MAX_PRIO] = {};
@ -1084,7 +1086,8 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla,
for (i = 1; i <= TCA_ACT_MAX_PRIO && tb[i]; i++) {
act = tcf_action_init_1(net, tp, tb[i], est, name, ovr, bind,
ops[i - 1], rtnl_held, extack);
ops[i - 1], &init_res[i - 1], rtnl_held,
extack);
if (IS_ERR(act)) {
err = PTR_ERR(act);
goto err;
@ -1497,12 +1500,13 @@ static int tcf_action_add(struct net *net, struct nlattr *nla,
struct netlink_ext_ack *extack)
{
size_t attr_size = 0;
int loop, ret;
int loop, ret, i;
struct tc_action *actions[TCA_ACT_MAX_PRIO] = {};
int init_res[TCA_ACT_MAX_PRIO] = {};
for (loop = 0; loop < 10; loop++) {
ret = tcf_action_init(net, NULL, nla, NULL, NULL, ovr, 0,
actions, &attr_size, true, extack);
actions, init_res, &attr_size, true, extack);
if (ret != -EAGAIN)
break;
}
@ -1510,7 +1514,11 @@ static int tcf_action_add(struct net *net, struct nlattr *nla,
if (ret < 0)
return ret;
ret = tcf_add_notify(net, n, actions, portid, attr_size, extack);
if (ovr)
/* only put existing actions */
for (i = 0; i < TCA_ACT_MAX_PRIO; i++)
if (init_res[i] == ACT_P_CREATED)
actions[i] = NULL;
tcf_action_put_many(actions);
return ret;

9
net/sched/cls_api.c
View File

@ -3040,6 +3040,7 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
{
#ifdef CONFIG_NET_CLS_ACT
{
int init_res[TCA_ACT_MAX_PRIO] = {};
struct tc_action *act;
size_t attr_size = 0;
@ -3051,8 +3052,8 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
return PTR_ERR(a_o);
act = tcf_action_init_1(net, tp, tb[exts->police],
rate_tlv, "police", ovr,
TCA_ACT_BIND, a_o, rtnl_held,
extack);
TCA_ACT_BIND, a_o, init_res,
rtnl_held, extack);
if (IS_ERR(act)) {
module_put(a_o->owner);
return PTR_ERR(act);
@ -3067,8 +3068,8 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
err = tcf_action_init(net, tp, tb[exts->action],
rate_tlv, NULL, ovr, TCA_ACT_BIND,
exts->actions, &attr_size,
rtnl_held, extack);
exts->actions, init_res,
&attr_size, rtnl_held, extack);
if (err < 0)
return err;
exts->nr_actions = err;