The patch below does not apply to the 5.11-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From b3650bf76a32380d4d80a3e21b5583e7303f216c Mon Sep 17 00:00:00 2001
From: Vlad Buslov vladbu@nvidia.com Date: Wed, 7 Apr 2021 18:36:04 +0300 Subject: [PATCH] net: sched: fix err handler in tcf_action_init()
With recent changes that separated action module load from action initialization tcf_action_init() function error handling code was modified to manually release the loaded modules if loading/initialization of any further action in same batch failed. For the case when all modules successfully loaded and some of the actions were initialized before one of them failed in init handler. In this case for all previous actions the module will be released twice by the error handler: First time by the loop that manually calls module_put() for all ops, and second time by the action destroy code that puts the module after destroying the action.
Reproduction:
$ sudo tc actions add action simple sdata "2" index 2 $ sudo tc actions add action simple sdata "1" index 1 \ action simple sdata "2" index 2 RTNETLINK answers: File exists We have an error talking to the kernel $ sudo tc actions ls action simple total acts 1
action order 0: Simple <"2"> index 2 ref 1 bind 0 $ sudo tc actions flush action simple $ sudo tc actions ls action simple $ sudo tc actions add action simple sdata "2" index 2 Error: Failed to load TC action module. We have an error talking to the kernel $ lsmod | grep simple act_simple 20480 -1
Fix the issue by modifying module reference counting handling in action initialization code:
- Get module reference in tcf_idr_create() and put it in tcf_idr_release() instead of taking over the reference held by the caller.
- Modify users of tcf_action_init_1() to always release the module reference which they obtain before calling init function instead of assuming that created action takes over the reference.
- Finally, modify tcf_action_init_1() to not release the module reference when overwriting existing action as this is no longer necessary since both upper and lower layers obtain and manage their own module references independently.
Fixes: d349f9976868 ("net_sched: fix RTNL deadlock again caused by request_module()") Suggested-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: Vlad Buslov vladbu@nvidia.com Signed-off-by: David S. Miller davem@davemloft.net
diff --git a/include/net/act_api.h b/include/net/act_api.h index 312f0f6554a0..086b291e9530 100644 --- a/include/net/act_api.h +++ b/include/net/act_api.h @@ -170,12 +170,7 @@ void tcf_idr_insert_many(struct tc_action *actions[]); void tcf_idr_cleanup(struct tc_action_net *tn, u32 index); int tcf_idr_check_alloc(struct tc_action_net *tn, u32 *index, struct tc_action **a, int bind); -int __tcf_idr_release(struct tc_action *a, bool bind, bool strict); - -static inline int tcf_idr_release(struct tc_action *a, bool bind) -{ - return __tcf_idr_release(a, bind, false); -} +int tcf_idr_release(struct tc_action *a, bool bind);
int tcf_register_action(struct tc_action_ops *a, struct pernet_operations *ops); int tcf_unregister_action(struct tc_action_ops *a, diff --git a/net/sched/act_api.c b/net/sched/act_api.c index 50854cfbfcdb..f6d5755d669e 100644 --- a/net/sched/act_api.c +++ b/net/sched/act_api.c @@ -158,7 +158,7 @@ static int __tcf_action_put(struct tc_action *p, bool bind) return 0; }
-int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) +static int __tcf_idr_release(struct tc_action *p, bool bind, bool strict) { int ret = 0;
@@ -184,7 +184,18 @@ int __tcf_idr_release(struct tc_action *p, bool bind, bool strict)
return ret; } -EXPORT_SYMBOL(__tcf_idr_release); + +int tcf_idr_release(struct tc_action *a, bool bind) +{ + const struct tc_action_ops *ops = a->ops; + int ret; + + ret = __tcf_idr_release(a, bind, false); + if (ret == ACT_P_DELETED) + module_put(ops->owner); + return ret; +} +EXPORT_SYMBOL(tcf_idr_release);
static size_t tcf_action_shared_attrs_size(const struct tc_action *act) { @@ -493,6 +504,7 @@ int tcf_idr_create(struct tc_action_net *tn, u32 index, struct nlattr *est, }
p->idrinfo = idrinfo; + __module_get(ops->owner); p->ops = ops; *a = p; return 0; @@ -1037,13 +1049,6 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp, if (!name) a->hw_stats = hw_stats;
- /* module count goes up only when brand new policy is created - * if it exists and is only bound to in a_o->init() then - * ACT_P_CREATED is not returned (a zero is). - */ - if (err != ACT_P_CREATED) - module_put(a_o->owner); - return a;
err_out: @@ -1103,7 +1108,8 @@ int tcf_action_init(struct net *net, struct tcf_proto *tp, struct nlattr *nla, tcf_idr_insert_many(actions);
*attr_size = tcf_action_full_attrs_size(sz); - return i - 1; + err = i - 1; + goto err_mod;
err: tcf_action_destroy(actions, bind); diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 9ecb91ebf094..340d5af86e87 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -3054,10 +3054,9 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb, rate_tlv, "police", ovr, TCA_ACT_BIND, a_o, init_res, rtnl_held, extack); - if (IS_ERR(act)) { - module_put(a_o->owner); + module_put(a_o->owner); + if (IS_ERR(act)) return PTR_ERR(act); - }
act->type = exts->type = TCA_OLD_COMPAT; exts->actions[0] = act;