Commit 6191da98 authored by Davide Caratti's avatar Davide Caratti Committed by David S. Miller

net/sched: act_skbedit: fix refcount leak when replace fails

when act_skbedit was converted to use RCU in the data plane, we added an
error path, but we forgot to drop the action refcount in case of failure
during a 'replace' operation:

 # tc actions add action skbedit ptype otherhost pass index 100
 # tc action show action skbedit
 total acts 1

         action order 0: skbedit  ptype otherhost pass
          index 100 ref 1 bind 0
 # tc actions replace action skbedit ptype otherhost drop index 100
 RTNETLINK answers: Cannot allocate memory
 We have an error talking to the kernel
 # tc action show action skbedit
 total acts 1

         action order 0: skbedit  ptype otherhost pass
          index 100 ref 2 bind 0

Ensure we call tcf_idr_release(), in case 'params_new' allocation failed,
also when the action is being replaced.

Fixes: c749cdda ("net/sched: act_skbedit: don't use spinlock in the data path")
Signed-off-by: default avatarDavide Caratti <dcaratti@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8f67c90e
...@@ -189,8 +189,7 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla, ...@@ -189,8 +189,7 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
if (unlikely(!params_new)) { if (unlikely(!params_new)) {
if (ret == ACT_P_CREATED) tcf_idr_release(*a, bind);
tcf_idr_release(*a, bind);
return -ENOMEM; return -ENOMEM;
} }
......
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