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| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2021-08-29 18:58:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-15 11:00:54 +0300 |
| commit | ab80a2c52b81d586c6520f19b2dbadcd23ffdffb (patch) | |
| tree | c1eece7dedde60bc4e19b66cf12df79cab11a062 /net/sched | |
| parent | 6b655ec90694727e6744e9d733296b443a5e34ff (diff) | |
| download | linux-ab80a2c52b81d586c6520f19b2dbadcd23ffdffb.tar.xz | |
net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
[ Upstream commit c66070125837900163b81a03063ddd657a7e9bfb ]
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.
Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/r/1630252681-71588-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_cbq.c | 2 |
1 files changed, 1 insertions, 1 deletions
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]) { |