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| author | Roman Mashak <mrv@mojatatu.com> | 2018-05-11 14:35:33 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-11 16:37:03 -0400 |
| commit | a52956dfc503f8cc5cfe6454959b7049fddb4413 (patch) | |
| tree | f00a5558d6d47ff70b07ac0ce7c772ec11f9edb8 | |
| parent | d68d75fdc34b0253c2bded7ed18cd60eb5a9599b (diff) | |
| download | linux-a52956dfc503f8cc5cfe6454959b7049fddb4413.tar.bz2 | |
net sched actions: fix refcnt leak in skbmod
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>
| -rw-r--r-- | net/sched/act_skbmod.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/sched/act_skbmod.c b/net/sched/act_skbmod.c index bbcbdce732cc..ad050d7d4b46 100644 --- a/net/sched/act_skbmod.c +++ b/net/sched/act_skbmod.c @@ -131,8 +131,11 @@ static int tcf_skbmod_init(struct net *net, struct nlattr *nla, 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, |