4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Davide Caratti <dcaratti@xxxxxxxxxx>
[ Upstream commit 6191da98062d25276a3b88fb2a94dcbcfb3ea65d ]
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: c749cdda9089 ("net/sched: act_skbedit: don't use spinlock in the data path")
Signed-off-by: Davide Caratti <dcaratti@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sched/act_skbedit.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -191,8 +191,7 @@ static int tcf_skbedit_init(struct net *
params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
if (unlikely(!params_new)) {
- if (ret == ACT_P_CREATED)
- tcf_idr_release(*a, bind);
+ tcf_idr_release(*a, bind);
return -ENOMEM;
}
