* [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
@ 2021-08-29 15:58 Xiyu Yang
2021-08-30 18:05 ` Jakub Kicinski
2021-08-31 3:40 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 4+ messages in thread
From: Xiyu Yang @ 2021-08-29 15:58 UTC (permalink / raw)
To: Jamal Hadi Salim, Cong Wang, Jiri Pirko, David S. Miller,
Jakub Kicinski, netdev, linux-kernel
Cc: Xiyu Yang
The reference counting issue happens in one exception handling path of
cbq_change_class(). When failing to get tcf_block, the function forgets
to decrease the refcount of "rtab" increased by qdisc_put_rtab(),
causing a refcount leak.
Fix this issue by jumping to "failure" label when get tcf_block failed.
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
---
net/sched/sch_cbq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index b79a7e27bb31..38a3a8394bbd 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1614,7 +1614,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32 parentid, struct nlattr **t
err = tcf_block_get(&cl->block, &cl->filter_list, sch, extack);
if (err) {
kfree(cl);
- return err;
+ goto failure;
}
if (tca[TCA_RATE]) {
--
2.7.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
2021-08-29 15:58 [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed Xiyu Yang
@ 2021-08-30 18:05 ` Jakub Kicinski
2021-08-31 1:18 ` Cong Wang
2021-08-31 3:40 ` patchwork-bot+netdevbpf
1 sibling, 1 reply; 4+ messages in thread
From: Jakub Kicinski @ 2021-08-30 18:05 UTC (permalink / raw)
To: Xiyu Yang
Cc: Jamal Hadi Salim, Cong Wang, Jiri Pirko, David S. Miller, netdev,
linux-kernel
On Sun, 29 Aug 2021 23:58:01 +0800 Xiyu Yang wrote:
> The reference counting issue happens in one exception handling path of
> cbq_change_class(). When failing to get tcf_block, the function forgets
> to decrease the refcount of "rtab" increased by qdisc_put_rtab(),
> causing a refcount leak.
>
> Fix this issue by jumping to "failure" label when get tcf_block failed.
>
> Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
2021-08-30 18:05 ` Jakub Kicinski
@ 2021-08-31 1:18 ` Cong Wang
0 siblings, 0 replies; 4+ messages in thread
From: Cong Wang @ 2021-08-31 1:18 UTC (permalink / raw)
To: Jakub Kicinski
Cc: Xiyu Yang, Jamal Hadi Salim, Jiri Pirko, David S. Miller,
Linux Kernel Network Developers, LKML
On Mon, Aug 30, 2021 at 11:05 AM Jakub Kicinski <kuba@kernel.org> wrote:
>
> On Sun, 29 Aug 2021 23:58:01 +0800 Xiyu Yang wrote:
> > The reference counting issue happens in one exception handling path of
> > cbq_change_class(). When failing to get tcf_block, the function forgets
> > to decrease the refcount of "rtab" increased by qdisc_put_rtab(),
> > causing a refcount leak.
> >
> > Fix this issue by jumping to "failure" label when get tcf_block failed.
> >
> > Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
>
> Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
2021-08-29 15:58 [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed Xiyu Yang
2021-08-30 18:05 ` Jakub Kicinski
@ 2021-08-31 3:40 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 4+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-08-31 3:40 UTC (permalink / raw)
To: Xiyu Yang; +Cc: jhs, xiyou.wangcong, jiri, davem, kuba, netdev, linux-kernel
Hello:
This patch was applied to netdev/net-next.git (refs/heads/master):
On Sun, 29 Aug 2021 23:58:01 +0800 you wrote:
> The reference counting issue happens in one exception handling path of
> cbq_change_class(). When failing to get tcf_block, the function forgets
> to decrease the refcount of "rtab" increased by qdisc_put_rtab(),
> causing a refcount leak.
>
> Fix this issue by jumping to "failure" label when get tcf_block failed.
>
> [...]
Here is the summary with links:
- net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
https://git.kernel.org/netdev/net-next/c/c66070125837
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-08-29 15:58 [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed Xiyu Yang
2021-08-30 18:05 ` Jakub Kicinski
2021-08-31 1:18 ` Cong Wang
2021-08-31 3:40 ` patchwork-bot+netdevbpf
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