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author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2021-08-29 23:58:01 +0800 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-15 10:02:31 +0200 |
commit | 8ea4229e9cc6f607b5c42843f5749d1cdf04aaa8 (patch) | |
tree | 501c758c64ac37a6fbdce937623ad8fc82ee35a7 | |
parent | 3b9cd2a38308467f6613f8ae6a7c2c7a9f9eea9b (diff) |
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>
-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]) { |