[PATCH 4.16 13/55] net sched actions: fix refcnt leak in skbmod

Greg Kroah-Hartman
2018-05-18T08:15:09Z

From: Roman Mashak <mrv@mojatatu.com>

[ Upstream commit a52956dfc503f8cc5cfe6454959b7049fddb4413 ]

When application fails to pass flags in netlink TLV when replacing
existing skbmod action, the kernel will leak refcnt:

$ tc actions get action skbmod index 1
total acts 0

action order 0: skbmod pipe set smac 00:11:22:33:44:55
index 1 ref 1 bind 0

For example, at this point a buggy application replaces the action with
index 1 with new smac 00:aa:22:33:44:55, it fails because of zero flags,
however refcnt gets bumped:

$ tc actions get actions skbmod index 1
total acts 0

action order 0: skbmod pipe set smac 00:11:22:33:44:55
index 1 ref 2 bind 0
$

Tha patch fixes this by calling tcf_idr_release() on existing actions.

Fixes: 86da71b57383d ("net_sched: Introduce skbmod action")
Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/sched/act_skbmod.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/sched/act_skbmod.c
+++ b/net/sched/act_skbmod.c
@@ -131,8 +131,11 @@ static int tcf_skbmod_init(struct net *n
if (exists && bind)
return 0;

- if (!lflags)
+ if (!lflags) {
+ if (exists)
+ tcf_idr_release(*a, bind);
return -EINVAL;
+ }

if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,