net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
Xiyu Yang authored
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: 6529eaba

 ("net: sched: introduce tcf block infractructure")
Signed-off-by: default avatarXiyu Yang <xiyuyang19@fudan.edu.cn>
Reviewed-by: default avatarCong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/r/1630252681-71588-1-git-send-email-xiyuyang19@fudan.edu.cn

Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
c6607012
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