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Date:   Sat, 30 May 2020 21:57:47 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] l2tp: add sk_family checks to l2tp_validate_socket

From: Eric Dumazet <>
Date: Fri, 29 May 2020 11:32:25 -0700

> syzbot was able to trigger a crash after using an ISDN socket
> and fool l2tp.
> Fix this by making sure the UDP socket is of the proper family.
> Fixes: 6b9f34239b00 ("l2tp: fix races in tunnel creation")
> Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
> Signed-off-by: Eric Dumazet <>
> Cc: James Chapman <>
> Cc: Guillaume Nault <>
> Reported-by: syzbot <>

Applied and queued up for -stable, thanks.

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