From: Paolo Abeni <[email protected]>
Date: Fri, 29 May 2020 17:49:18 +0200
> When token lookup on MP_JOIN 3rd ack fails, the server
> socket closes with a reset the incoming child. Such socket
> has the 'is_mptcp' flag set, but no msk socket associated
> - due to the failed lookup.
>
> While crafting the reset packet mptcp_established_options_mp()
> will try to dereference the child's master socket, causing
> a NULL ptr dereference.
>
> This change addresses the issue with explicit fallback to
> TCP in such error path.
>
> Fixes: 729cd6436f35 ("mptcp: cope better with MP_JOIN failure")
> Signed-off-by: Paolo Abeni <[email protected]>
Applied, thank you.
