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Date:   Tue, 26 May 2020 20:18:59 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH net] mptcp: avoid NULL-ptr derefence on fallback

From: Paolo Abeni <>
Date: Mon, 25 May 2020 16:38:47 +0200

> In the MPTCP receive path we must cope with TCP fallback
> on blocking recvmsg(). Currently in such code path we detect
> the fallback condition, but we don't fetch the struct socket
> required for fallback.
> The above allowed syzkaller to trigger a NULL pointer
> dereference:
> Address the issue initializing the struct socket reference
> before entering the fallback code.
> Reported-and-tested-by:
> Suggested-by: Ondrej Mosnacek <>
> Fixes: 8ab183deb26a ("mptcp: cope with later TCP fallback")
> Signed-off-by: Paolo Abeni <>

Applied and queued up for -stable, thanks.

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