Re: [PATCH] net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed

From: Jakub Kicinski
Date: Mon Aug 30 2021 - 14:05:55 EST

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@xxxxxxxxxxxx>

Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")