[PATCH net 3/7] net/sched: fix idr leak in the error path of tcf_act_police_init()

[Davide Caratti]

tcf_act_police_init() can fail after the idr has been successfully
reserved (e.g., qdisc_get_rtab() may return NULL). When this happens,
subsequent attempts to configure a police rule using the same idr value
systematiclly fail with -ENOSPC:

 # tc action add action police rate 1000 burst 1000 drop index 100
 RTNETLINK answers: Cannot allocate memory
 We have an error talking to the kernel
 # tc action add action police rate 1000 burst 1000 drop index 100
 RTNETLINK answers: No space left on device
 We have an error talking to the kernel
 # tc action add action police rate 1000 burst 1000 drop index 100
 RTNETLINK answers: No space left on device
 ...

Fix this in the error path of tcf_act_police_init(), calling
tcf_idr_release() in place of tcf_idr_cleanup().

Fixes: 65a206c01e8e ("net/sched: Change act_api and act_xxx modules to use IDR")
Signed-off-by: Davide Caratti <dcara...@redhat.com>
---
 net/sched/act_police.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 95d3c9097b25..faebf82b99f1 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -194,7 +194,7 @@ static int tcf_act_police_init(struct net *net, struct 
nlattr *nla,
        qdisc_put_rtab(P_tab);
        qdisc_put_rtab(R_tab);
        if (ret == ACT_P_CREATED)
-               tcf_idr_cleanup(*a, est);
+               tcf_idr_release(*a, bind);
        return err;
 }
 
-- 
2.14.3