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Date:   Wed, 24 Apr 2019 14:43:08 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] ipv4: add sanity checks in ipv4_link_failure()

From: Eric Dumazet <>
Date: Wed, 24 Apr 2019 08:04:05 -0700

> Before calling __ip_options_compile(), we need to ensure the network
> header is a an IPv4 one, and that it is already pulled in skb->head.
> RAW sockets going through a tunnel can end up calling ipv4_link_failure()
> with total garbage in the skb, or arbitrary lengthes.
> syzbot report :
> Fixes: ed0de45a1008 ("ipv4: recompile ip options in ipv4_link_failure")
> Signed-off-by: Eric Dumazet <>

Applied and queued up for -stable.

Thanks for fixing this.

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