From nobody Mon Mar 17 05:52:27 2025 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 1CF7A155738; Tue, 1 Oct 2024 08:20:38 +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=1727770839; cv=none; b=WRtppBUQo1CNYlaX68Pc3IF3slCFl+HiMyGgvnuoZf8Wwfr/FvAdWQIhZ/UD7BR0B31VjyDsTY/IjMQAiO8ZrYS2bATD1S2/1uO24bpGtN6EO0owzHdXGTfAjN664+5dZi1NSj/ot95rhoggnPJzenibh4ksaTD2zA90bQegdTs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727770839; c=relaxed/simple; bh=JqXxwqzTdHga2r7VvXVi0JZ8PUa7VDm3YAVV2+9Ak9g=; h=Subject:To:Cc:From:Date:In-Reply-To:Message-ID:MIME-Version: Content-Type; b=eEo0aMmzsKbINCoEVG950uuWCClCJOWLguxTrajbOakluNjG2d7rAyEk4ygVI40+9OPLyHt7MHJUb4o1elEIh9wGcfpDivDt/voLMTrUb9DJ8TLycI1nU2fPYc0Z+Uw8g6js4uYsuxdthRNuoJNTJZs7+p9noiUGJ2NMZCExXuo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zTuw1Pqv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zTuw1Pqv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AEABC4CEC6; Tue, 1 Oct 2024 08:20:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1727770838; bh=JqXxwqzTdHga2r7VvXVi0JZ8PUa7VDm3YAVV2+9Ak9g=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=zTuw1PqvPl20G7sVhbJk9y3YyxCVlMYpVYt0b1Boha7+1zjvKs/y+S1tt3uRCc3F6 RpHC93VT/EUB2Zb7ACwKHpuvRo5l+EnB4g6dyAOmb/myhQhPfv2m+JZcUomt4VpNzT KCoqwlQcwq86SvxifWAuh44SxsKSqty2mRUQL9ZQ= Subject: Patch "mptcp: fix sometimes-uninitialized warning" has been added to the 5.10-stable tree To: gregkh@linuxfoundation.org,matttbe@kernel.org,mptcp@lists.linux.dev,nathan@kernel.org Cc: From: Date: Tue, 01 Oct 2024 10:20:24 +0200 In-Reply-To: <20240930162345.3938790-2-matttbe@kernel.org> Message-ID: <2024100124-overact-matchbox-6cda@gregkh> Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-stable: commit X-Patchwork-Hint: ignore Content-Type: text/plain; charset="utf-8" This is a note to let you know that I've just added the patch titled mptcp: fix sometimes-uninitialized warning to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=3Dlinux/kernel/git/stable/stable-queue.git= ;a=3Dsummary The filename of the patch is: mptcp-fix-sometimes-uninitialized-warning.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. From matttbe@kernel.org Tue Oct 1 10:14:56 2024 From: "Matthieu Baerts (NGI0)" Date: Mon, 30 Sep 2024 18:23:46 +0200 Subject: mptcp: fix sometimes-uninitialized warning To: stable@vger.kernel.org, gregkh@linuxfoundation.org Cc: MPTCP Upstream , "Matthieu Baerts (NGI0)" , Nathan Chancellor Message-ID: <20240930162345.3938790-2-matttbe@kernel.org> From: "Matthieu Baerts (NGI0)" Nathan reported this issue: $ make -skj"$(nproc)" ARCH=3Dx86_64 LLVM=3D1 LLVM_IAS=3D1 mrproper allmod= config net/mptcp/subflow.o net/mptcp/subflow.c:877:6: warning: variable 'incr' is used uninitialized= whenever 'if' condition is true [-Wsometimes-uninitialized] 877 | if (WARN_ON_ONCE(offset > skb->len)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:101:33: note: expanded from macro 'WARN_ON_ONCE' 101 | #define WARN_ON_ONCE(condition) ({ \ | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 102 | int __ret_warn_on =3D !!(condition); = \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 103 | if (unlikely(__ret_warn_on)) \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 104 | __WARN_FLAGS(BUGFLAG_ONCE | \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 105 | BUGFLAG_TAINT(TAINT_WARN)); \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 106 | unlikely(__ret_warn_on); \ | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 107 | }) | ~~ net/mptcp/subflow.c:893:6: note: uninitialized use occurs here 893 | if (incr) | ^~~~ net/mptcp/subflow.c:877:2: note: remove the 'if' if its condition is alwa= ys false 877 | if (WARN_ON_ONCE(offset > skb->len)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 878 | goto out; | ~~~~~~~~ net/mptcp/subflow.c:874:18: note: initialize the variable 'incr' to silen= ce this warning 874 | u32 offset, incr, avail_len; | ^ | =3D 0 1 warning generated. As mentioned by Nathan, this issue is present because 5.10 does not include commit ea4ca586b16f ("mptcp: refine MPTCP-level ack scheduling"), which removed the use of 'incr' in the error path added by this change. This other commit does not really look suitable for stable, hence this dedicated patch for 5.10. Fixes: e93fa44f0714 ("mptcp: fix duplicate data handling") Reported-by: Nathan Chancellor Closes: https://lore.kernel.org/20240928175524.GA1713144@thelio-3990X Signed-off-by: Matthieu Baerts (NGI0) Signed-off-by: Greg Kroah-Hartman --- net/mptcp/subflow.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -871,7 +871,7 @@ static void mptcp_subflow_discard_data(s struct mptcp_subflow_context *subflow =3D mptcp_subflow_ctx(ssk); bool fin =3D TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN; struct tcp_sock *tp =3D tcp_sk(ssk); - u32 offset, incr, avail_len; + u32 offset, incr =3D 0, avail_len; =20 offset =3D tp->copied_seq - TCP_SKB_CB(skb)->seq; if (WARN_ON_ONCE(offset > skb->len)) Patches currently in stable-queue which might be from matttbe@kernel.org are queue-5.10/mptcp-export-lookup_anno_list_by_saddr.patch queue-5.10/mptcp-validate-id-when-stopping-the-add_addr-retransmit-timer.pa= tch queue-5.10/mptcp-fix-sometimes-uninitialized-warning.patch queue-5.10/mptcp-pm-fix-uaf-in-__timer_delete_sync.patch