Re: [Patch net-next 2/2] net_sched: fix a memory leak in cls_tcindex

[David Miller <davem@davemloft.net>]

From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Sat, 16 Feb 2019 10:58:27 -0800

> (cherry picked from commit 033b228e7f26b29ae37f8bfa1bc6b209a5365e9f)
> 
> When tcindex_destroy() destroys all the filter results in
> the perfect hash table, it invokes the walker to delete
> each of them. However, results with class==0 are skipped
> in either tcindex_walk() or tcindex_delete(), which causes
> a memory leak reported by kmemleak.
> 
> This patch fixes it by skipping the walker and directly
> deleting these filter results so we don't miss any filter
> result.
> 
> As a result of this change, we have to initialize exts->net
> properly in tcindex_alloc_perfect_hash(). For net-next, we
> need to consider whether we should initialize ->net in
> tcf_exts_init() instead, before that just directly test
> CONFIG_NET_CLS_ACT=y.
> 
> Cc: Jamal Hadi Salim <jhs@mojatatu.com>
> Cc: Jiri Pirko <jiri@resnulli.us>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Applied.