netdev - Re: [PATCH 44/44] net/mptcp: Change some dubious min

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Message-ID: <cd5d45f7-0d76-4f82-849e-2f2c1544d907@kernel.org>
Date: Thu, 18 Dec 2025 18:33:26 +0100
From: Matthieu Baerts <matttbe@...nel.org>
To: david.laight.linux@...il.com, linux-kernel@...r.kernel.org,
 mptcp@...ts.linux.dev, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Mat Martineau <martineau@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH 44/44] net/mptcp: Change some dubious min_t(int, ...) to
 min()

Hi David,

On 19/11/2025 23:41, david.laight.linux@...il.com wrote:
> From: David Laight <david.laight.linux@...il.com>
> 
> There are two:
> 	min_t(int, xxx, mptcp_wnd_end(msk) - msk->snd_nxt);
> Both mptcp_wnd_end(msk) and msk->snd_nxt are u64, their difference
> (aka the window size) might be limited to 32 bits - but that isn't
> knowable from this code.
> So checks being added to min_t() detect the potential discard of
> significant bits.
> 
> Provided the 'avail_size' and return of mptcp_check_allowed_size()
> are changed to an unsigned type (size_t matches the type the caller
> uses) both min_t() can be changed to min().

Thank you for the patch!

Reviewed-by: Matthieu Baerts (NGI0) <matttbe@...nel.org>

I'm not sure what the status on your side: I don't know if you still
plan to send a specific series for all the modifications in the net, but
just in case, I just applied your patch in the MPTCP tree. I removed the
"net/" prefix from the subject. I will send this patch with others for
including in the net-next tree later on if you didn't do that in between.

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