netdev - Re: [PATCHv2 nf] netfilter: ip6t_rt: fix rt0_hdr parsing in rt

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Message-ID: <YWicgKOG51NLyyi7@salvia>
Date:   Thu, 14 Oct 2021 23:09:20 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
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,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCHv2 nf] netfilter: ip6t_rt: fix rt0_hdr parsing in rt_mt6

On Tue, Oct 12, 2021 at 08:18:13AM -0400, Xin Long 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.

Applied, thanks