netdev - Re: [Patch stable] netfilter: clear skb->next in NF_HOOK

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Message-ID: <20201121222249.GU15137@breakpoint.cc>
Date:   Sat, 21 Nov 2020 23:22:49 +0100
From:   Florian Westphal <fw@...len.de>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, Cong Wang <cong.wang@...edance.com>,
        liuzx@...wnsec.com, Florian Westphal <fw@...len.de>,
        Edward Cree <ecree@...arflare.com>, stable@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [Patch stable] netfilter: clear skb->next in NF_HOOK_LIST()

Cong Wang <xiyou.wangcong@...il.com> wrote:
> From: Cong Wang <cong.wang@...edance.com>
> 
> NF_HOOK_LIST() uses list_del() to remove skb from the linked list,
> however, it is not sufficient as skb->next still points to other
> skb. We should just call skb_list_del_init() to clear skb->next,
> like the rest places which using skb list.
> 
> This has been fixed in upstream by commit ca58fbe06c54
> ("netfilter: add and use nf_hook_slow_list()").

Thanks Cong, agree with this change, afaics its applicable to 4.19.y and 5.4.y.