netdev - Re: [Patch net 2/3] idr: introduce idr_for_each_entry_continue

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Message-ID: <5f04b3f5b5d54a86f151f17d83bfe4931433ec33.camel@redhat.com>
Date:   Fri, 28 Jun 2019 23:14:53 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     chrism@...lanox.com, willy@...radead.org,
        Li Shuang <shuali@...hat.com>,
        Vlad Buslov <vladbu@...lanox.com>
Subject: Re: [Patch net 2/3] idr: introduce idr_for_each_entry_continue_ul()

On Fri, 2019-06-28 at 11:03 -0700, Cong Wang wrote:
> Similarly, other callers of idr_get_next_ul() suffer the same
> overflow bug as they don't handle it properly either.
> 
> Introduce idr_for_each_entry_continue_ul() to help these callers
> iterate from a given ID.
> 
> cls_flower needs more care here because it still has overflow when
> does arg->cookie++, we have to fold its nested loops into one
> and remove the arg->cookie++.

hello Cong,

I confirm that this patch fixes the infinite loop when dumping TC flower
rule with handle 0xffffffff on kernel 5.2.0-0.rc5.git0.1.fc31.i686.

Tested-by: Davide Caratti <dcaratti@...hat.com>

thanks!
-- 
davide