diff options
| author |   Vlad Buslov <vladbu@nvidia.com> | 2021-04-07 18:36:03 +0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2021-04-08 13:47:33 -0700 |
| commit | 87c750e8c38bce706eb32e4d8f1e3402f2cebbd4 (patch) | |
| tree | 4d5c73cbd7a1b764b7af10521233a872b36c42c7 /include/net/act_api.h | |
| parent | Revert "net: sched: bump refcount for new action in ACT replace mode" (diff) | |
| download | linux-dev-87c750e8c38bce706eb32e4d8f1e3402f2cebbd4.tar.xz linux-dev-87c750e8c38bce706eb32e4d8f1e3402f2cebbd4.zip | |
net: sched: fix action overwrite reference counting
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: cae422f379f3 ("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>
Diffstat (limited to 'include/net/act_api.h')
| -rw-r--r-- | include/net/act_api.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/net/act_api.h b/include/net/act_api.h index 2bf3092ae7ec..312f0f6554a0 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -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); |