Re: FAILED: patch "[PATCH] mptcp: pm: ADD_ADDR 0 is not a new address" failed to apply to 5.10-stable tree

[Matthieu Baerts <matttbe@kernel.org>]

Hi Greg,

On 30/08/2024 12:26, gregkh@linuxfoundation.org wrote:
> 
> The patch below does not apply to the 5.10-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.

Thank you for the notification!

(...)

> ------------------ original commit in Linus's tree ------------------
> 
> From 57f86203b41c98b322119dfdbb1ec54ce5e3369b Mon Sep 17 00:00:00 2001
> From: "Matthieu Baerts (NGI0)" <matttbe@kernel.org>
> Date: Wed, 28 Aug 2024 08:14:37 +0200
> Subject: [PATCH] mptcp: pm: ADD_ADDR 0 is not a new address
> 
> The ADD_ADDR 0 with the address from the initial subflow should not be
> considered as a new address: this is not something new. If the host
> receives it, it simply means that the address is available again.
> 
> When receiving an ADD_ADDR for the ID 0, the PM already doesn't consider
> it as new by not incrementing the 'add_addr_accepted' counter. But the
> 'accept_addr' might not be set if the limit has already been reached:
> this can be bypassed in this case. But before, it is important to check
> that this ADD_ADDR for the ID 0 is for the same address as the initial
> subflow. If not, it is not something that should happen, and the
> ADD_ADDR can be ignored.
> 
> Note that if an ADD_ADDR is received while there is already a subflow
> opened using the same address, this ADD_ADDR is ignored as well. It
> means that if multiple ADD_ADDR for ID 0 are received, there will not be
> any duplicated subflows created by the client.
> 
> Fixes: d0876b2284cf ("mptcp: add the incoming RM_ADDR support")

The code is too different in v5.10, and I don't think it is worth it to
have this small fix in v5.10.

Cheers,
Matt
-- 
Sponsored by the NGI0 Core fund.