netdev - Re: [PATCH nf] netfilter: ip6t_rt: fix rt0_hdr parsing in rt

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Date:   Tue, 12 Oct 2021 12:30:15 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Florian Westphal <fw@...len.de>
Cc:     Xin Long <lucien.xin@...il.com>,
        network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        kuba@...nel.org, netfilter-devel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH nf] netfilter: ip6t_rt: fix rt0_hdr parsing in rt_mt6

On Tue, Oct 12, 2021 at 12:02:04PM +0200, Florian Westphal wrote:
> Xin Long <lucien.xin@...il.com> wrote:
> > In rt_mt6(), when it's a nonlinear skb, the 1st skb_header_pointer()
> > only copies sizeof(struct ipv6_rt_hdr) to _route that rh points to.
> > The access by ((const struct rt0_hdr *)rh)->reserved will overflow
> > the buffer. So this access should be moved below the 2nd call to
> > skb_header_pointer().
> > 
> > Besides, after the 2nd skb_header_pointer(), its return value should
> > also be checked, othersize, *rp may cause null-pointer-ref.
> 
> Patch looks good but I think you can just axe these pr_debug statements
> instead of moving them.
> 
> Before pr_debug conversion these statments were #if-0 out, I don't think
> they'll be missed if they are removed.

Agreed.