linux-kernel - Re: [PATCH net] ipv6: Fix out-of-bounds access in ipv6_find

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Message-ID: <ZGy/BrpnnxALpjqF@nanopsycho>
Date:   Tue, 23 May 2023 15:26:30 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
Cc:     "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vlad Yasevich <vyasevic@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>
Subject: Re: [PATCH net] ipv6: Fix out-of-bounds access in ipv6_find_tlv()

Tue, May 23, 2023 at 10:29:44AM CEST, Ilia.Gavrilov@...otecs.ru wrote:
>optlen is fetched without checking whether there is more than one byte to parse.
>It can lead to out-of-bounds access.
>
>Found by InfoTeCS on behalf of Linux Verification Center
>(linuxtesting.org) with SVACE.
>
>Fixes: 3c73a0368e99 ("ipv6: Update ipv6 static library with newly needed functions")
>Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>

Reviewed-by: Jiri Pirko <jiri@...dia.com>