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

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Date:   Tue, 12 Oct 2021 12:02:04 +0200
From:   Florian Westphal <fw@...len.de>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, davem@...emloft.net,
        kuba@...nel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH nf] netfilter: ip6t_rt: fix rt0_hdr parsing in rt_mt6

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.