]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
net sched actions: fix refcnt leak in skbmod
authorRoman Mashak <mrv@mojatatu.com>
Fri, 11 May 2018 18:35:33 +0000 (14:35 -0400)
committerDavid S. Miller <davem@davemloft.net>
Fri, 11 May 2018 20:37:03 +0000 (16:37 -0400)
commita52956dfc503f8cc5cfe6454959b7049fddb4413
treef00a5558d6d47ff70b07ac0ce7c772ec11f9edb8
parentd68d75fdc34b0253c2bded7ed18cd60eb5a9599b
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>
net/sched/act_skbmod.c