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 1E57838C437; Mon, 4 May 2026 10:00:03 +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=1777888803; cv=none; b=YBnYl1K/DdE9iFar0VQGm1VG4aZaw6bZqhdnOK1xA8BcklmU6fhtri5EEsq3z5DxM5b5NpWqk+qu23NEUuQ8drl2YKFn6n67LKdFonNUfz/1LAxQ2x0Vu9LIFGxlIojUMF1c+msL7kcpE3FAd4wM+zNC6I0/ent3aAJuw2qSsYA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777888803; c=relaxed/simple; bh=vHpJCYw2078p0TiaafkuY62mET/Tf0pKY2x6ybysoGo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=fssFyDrYFxK6Dqv0qVBohGi3jQby8DBumMDlwOLYw+519meYgkXG/23XrECGU/aUD6j7CCxOV9X3S0JPgC7G/W5GG2JCMHx54nOLPibybs8ZMVbthsiY5kipUy29o6YYf0VW1meX96qoTdWDUCI8QETkco4jSfCJ2roMAvQIvZU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AEbJ2uEt; 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="AEbJ2uEt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 924B3C2BCB8; Mon, 4 May 2026 10:00:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777888803; bh=vHpJCYw2078p0TiaafkuY62mET/Tf0pKY2x6ybysoGo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=AEbJ2uEtSSvt16PN1MV2cLpSCbNBz05tDYmiXdzG9JThZfox105BysSarQPzIB5D3 BrsJDX2CTmncsPJDwbRnyX0NEc90BNYd0QwPvRVBVHTObr2cBENOTSI2K9afw1xr+o kWpwfaVGL6MR/9fPfETinOH8JKh98qy0ez+MPAYTVHGEOTywdLPjabJSVaF0VoAGNd 2RxLmhNiF1tl8oYVYwuKne2ud7EPAARObIldvFPas/5Vzz+w1d2/5qbkaPd9zo/4pd c0ybp7eYS9Xv6KU+rS6WMj83nX4PxXTzwiKS5vV2q85S24OpNVda/MV6IVsGymPbUW aYxPpIZE2C2FA== Message-ID: <67030b5e-0435-49fc-8adb-8dd8536ad853@kernel.org> Date: Mon, 4 May 2026 11:59:59 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH] mptcp: fix KMSAN: uninit-value in mptcp_established_options Content-Language: fr To: mptcp@lists.linux.dev Cc: syzbot+ff020673c5e3d94d9478@syzkaller.appspotmail.com, Paolo Abeni , Kuniyuki Iwashima , syzkaller-bugs@googlegroups.com, linux-kernel@vger.kernel.org References: <69f44505.050a0220.3cbe47.0008.GAE@google.com> <20260504095101.852039-2-matttbe@kernel.org> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hello, On 04/05/2026 11:51, Matthieu Baerts (NGI0) wrote: > Just to let syzbot testing it. Sorry for the noise: I forgot to add the syzbot instruction... (and I forgot to remove the MPTCP ML from the sendmail.to option). Hopefully now the following is correct: #syz test diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 8a1c5698983c..24903a12a4e0 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -583,6 +583,8 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb, map_size += TCPOLEN_MPTCP_DSS_CHECKSUM; opts->ext_copy = *mpext; + } else { + opts->ext_copy.use_map = 0; } dss_size = map_size;