From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1061430FC1C for ; Tue, 19 May 2026 02:35:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779158134; cv=none; b=jWNlCuAsy1dEZkuGTEz4QJrTTRq7W1OY5VFFkfsf2AmRTZa3RLKcrmQ3iZBoGf/nmP/qu7oJHCfdaOHNZ/z/quRV5rVkH/3AK179Ip2gf7wpFsJpSxyXhoey6xv5y9mmTr4xRSCibvEYLiZ44bdT3L1wMGXvzP3ZerixVZH3r74= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779158134; c=relaxed/simple; bh=koFwE+idMYDOoYR+8Hxm4I7rPO2TtkAQfWHm46h45bc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lTVLbWrXVe6u072BOWxEvtvMEApx5Q2WRE75u/SEd9p8KvjN3S/6SYHoY3ieSV+3lM0+fK/Il0QAsb7Bo7AZVU8HcfoHTQd6UnZetlx+n7PTfVA7Rr4rffs9nbwRcPbGYp+3iavHehg2+olPlLNMEHFbb0PEiVJHFK/D9ZR9H7E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UoOX9otl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UoOX9otl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50875C2BCB7; Tue, 19 May 2026 02:35:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1779158133; bh=koFwE+idMYDOoYR+8Hxm4I7rPO2TtkAQfWHm46h45bc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=UoOX9otl68KyE8B++Yz777x8VZKxNouICaPEXyaZTtNC7/kbRPr6quM8ngRSb3HCw hhaPJsQpiOHyXsKRmv6a3BgAUrtbVuU7Np+N+c7yFRIGcqe+KBlW4pKnH42vrjahFJ Fv4YQ11nxOTJ/AeeUikWoqAMy/urmAegcTFvhlVlSc1ymAvXO/UeXdq8bPNBw2eroD yw1VfcNDZYJHg3qu5tvaw4jjOLc7oegoHN8DFCCr+Y+0y8XVk1lSqWQCE3hDoQqQug 05mYdLL4PD6VXPuktAJ9YmBGdtsLPQB6ZVVctT1tg2uiD9pHzA4rhClOCGlh6xy2AX QUeOo7X5a4bNg== Message-ID: Date: Tue, 19 May 2026 12:35:29 +1000 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH 6.12.y] mptcp: pm: ADD_ADDR rtx: always decrease sk refcount Content-Language: fr To: Sasha Levin , stable@vger.kernel.org Cc: Mat Martineau , Jakub Kicinski References: <2026051230-anime-juniper-5ad1@gregkh> <20260518144734.1381693-1-sashal@kernel.org> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Sasha, On 19/05/2026 00:47, Sasha Levin wrote: > From: "Matthieu Baerts (NGI0)" > > [ Upstream commit 9634cb35af17019baec21ca648516ce376fa10e6 ] > > When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). > It should then be released in all cases at the end. > > Some (unlikely) checks were returning directly instead of calling > sock_put() to decrease the refcount. Jump to a new 'exit' label to call > __sock_put() (which will become sock_put() in the next commit) to fix > this potential leak. > > While at it, drop the '!msk' check which cannot happen because it is > never reset, and explicitly mark the remaining one as "unlikely". > > Fixes: 00cfd77b9063 ("mptcp: retransmit ADD_ADDR when timeout") > Cc: stable@vger.kernel.org > Reviewed-by: Mat Martineau > Signed-off-by: Matthieu Baerts (NGI0) > Link: https://patch.msgid.link/20260505-net-mptcp-pm-fixes-7-1-rc3-v1-4-fca8091060a4@kernel.org > Signed-off-by: Jakub Kicinski > [ reused existing `out:` label instead of introducing a new `exit:` label since stable's `out:` only does `__sock_put(sk)` ] See my comment for the same patch for 6.6: this conflict shouldn't exist if "mptcp: pm: ADD_ADDR rtx: fix potential data-race" you sent earlier is applied first. Cheers, Matt -- Sponsored by the NGI0 Core fund.