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net_sched: act: Dont increment refcnt on replace

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This is a bug fix. The existing code tries to kill many
 birds with one stone: Handling binding of actions to
 filters, new actions and replacing of action
 attributes. A simple test case to illustrate:

XXXX
 moja@fe1:~$ sudo tc actions add action drop index 12
 moja@fe1:~$ actions get action gact index 12
 action order 1: gact action drop
  random type none pass val 0
  index 12 ref 1 bind 0
 moja@fe1:~$ sudo tc actions replace action ok index 12
 moja@fe1:~$ actions get action gact index 12
 action order 1: gact action drop
  random type none pass val 0
  index 12 ref 2 bind 0
XXXX

The above shows the refcounf being wrongly incremented on replace.
There are more complex scenarios with binding of actions to filters
that i am leaving out that didnt work as well...

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jamal Hadi Salim
2013-12-23 08:02:11 -05:00
committed by David S. Miller
parent c2349758ac
commit 1a29321ed0
8 changed files with 37 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files
net/sched/act_nat.c
+5 -5
View File
@@ -70,15 +70,15 @@ static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
&nat_idx_gen, &nat_hash_info);
if (IS_ERR(pc))
return PTR_ERR(pc);
p = to_tcf_nat(pc);
ret = ACT_P_CREATED;
} else {
p = to_tcf_nat(pc);
if (!ovr) {
tcf_hash_release(pc, bind, &nat_hash_info);
if (bind)
return 0;
tcf_hash_release(pc, bind, &nat_hash_info);
if (!ovr)
return -EEXIST;
}
}
p = to_tcf_nat(pc);
spin_lock_bh(&p->tcf_lock);
p->old_addr = parm->old_addr;