linux-kernel - Re: [PATCH] net: geneve: check skb is large enough for IPv4/IPv6 header

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Message-ID: <CANn89iL43xRD6CYrJbUDoaXYhDQ+FAh5fAMn3d3LaDgi1uz9iQ@mail.gmail.com>
Date:   Sun, 11 Apr 2021 17:21:23 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     Phillip Potter <phil@...lpotter.co.uk>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: geneve: check skb is large enough for IPv4/IPv6 header

On Sun, Apr 11, 2021 at 1:28 PM Phillip Potter <phil@...lpotter.co.uk> wrote:
>
> Check within geneve_xmit_skb/geneve6_xmit_skb that sk_buff structure
> is large enough to include IPv4 or IPv6 header, and reject if not. The
> geneve_xmit_skb portion and overall idea was contributed by Eric Dumazet.
> Fixes a KMSAN-found uninit-value bug reported by syzbot at:
> https://syzkaller.appspot.com/bug?id=abe95dc3e3e9667fc23b8d81f29ecad95c6f106f
>
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot+2e406a9ac75bb71d4b7a@...kaller.appspotmail.com
> Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>

Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Thanks !