netdev - Re: [PATCH net] ipv6: accept 64k - 1 packet length in ip6_find

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 22 Aug 2017 10:23:48 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     sbrivio@...hat.com
Cc:     netdev@...r.kernel.org, sd@...asysnail.net,
        hannes@...essinduktion.org
Subject: Re: [PATCH net] ipv6: accept 64k - 1 packet length in
 ip6_find_1stfragopt()

From: Stefano Brivio <sbrivio@...hat.com>
Date: Fri, 18 Aug 2017 14:40:53 +0200

> A packet length of exactly IPV6_MAXPLEN is allowed, we should
> refuse parsing options only if the size is 64KiB or more.
> 
> While at it, remove one extra variable and one assignment which
> were also introduced by the commit that introduced the size
> check. Checking the sum 'offset + len' and only later adding
> 'len' to 'offset' doesn't provide any advantage over directly
> summing to 'offset' and checking it.
> 
> Fixes: 6399f1fae4ec ("ipv6: avoid overflow of offset in ip6_find_1stfragopt")
> Signed-off-by: Stefano Brivio <sbrivio@...hat.com>

Applied, thanks.