From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 E422B4071E3; Sun, 7 Jun 2026 10:29:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780828157; cv=none; b=L16IKjjAHqUWnBYGC3E909KCMDUTGV3hNXEvy7ATl7eRHm9/re1Ma1zNqKM4hxesX4Y3iEEJDM2+eX2x4eNBCf+iPHHP5JmZnLMq5yAs5NRVyNMn8Y6ePLrbdHM53xqembMSfsXrKRUV9ribHi7ZFY11eiuq5kCqyQaYsF+lshg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780828157; c=relaxed/simple; bh=FcyKWVG7lVcCDiWbHx+dbp55zDQFYxdiHH0eyLWQy3c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JZJPVObT1DnD4QM9P0ThZpx2zoNqJGVlUeXzmFUl/TyJ7Usd4aBhKTVa1ThF5Yy5piYViJz3muq+pvA8LTfq7ZfmN8/XgEp17dvVuetMgTok6KMkxcLaydeUGwE8WBHlQiJyoVynFlG4d1A66Ax4z2N8HizLvNb+rSXJMga1mnQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CnBqyrkw; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="CnBqyrkw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 01BE71F0089F; Sun, 7 Jun 2026 10:29:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780828156; bh=9tnQv36PEFNbCvYQAMPbo+Gq/DKmj7RLWkPKWvxVoJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CnBqyrkwXp2ZZFrWG1Y2wSj3pLUZ8gOFhc0SqTtjHRyIpRoxT6IE1zwmj9Y45g9Fz 8vqgqfOZ2Po5IxTi4rzWCLr0u8SPmvyjyV0v9xDPC4UC0G33nhbszsD3GaAc9foyYD YpkdzLnmJcw12aELBCgSby0aCjG2A+X7zh7KW3iI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhenghang Xiao , Xin Long , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12 092/307] sctp: fix race between sctp_wait_for_connect and peeloff Date: Sun, 7 Jun 2026 11:58:09 +0200 Message-ID: <20260607095731.156749290@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260607095727.647295505@linuxfoundation.org> References: <20260607095727.647295505@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhenghang Xiao [ Upstream commit f14fe6395a8b3d961a61e138ad7b36ba3626dd4e ] sctp_wait_for_connect() drops and re-acquires the socket lock while waiting for the association to reach ESTABLISHED state. During this window, another thread can peeloff the association to a new socket via getsockopt(SCTP_SOCKOPT_PEELOFF), changing asoc->base.sk. After re-acquiring the old socket lock, sctp_wait_for_connect() returns success without noticing the migration — the caller then accesses the association under the wrong lock in sctp_datamsg_from_user(). Add the same sk != asoc->base.sk check that sctp_wait_for_sndbuf() already has, returning an error if the association was migrated while we slept. Fixes: 668c9beb9020 ("sctp: implement assign_number for sctp_stream_interleave") Signed-off-by: Zhenghang Xiao Acked-by: Xin Long Link: https://patch.msgid.link/20260527032411.60959-1-kipreyyy@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sctp/socket.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 6b562dd1aae110..3e80cf4e63ff00 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -9377,6 +9377,8 @@ static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p) release_sock(sk); current_timeo = schedule_timeout(current_timeo); lock_sock(sk); + if (sk != asoc->base.sk) + goto do_error; *timeo_p = current_timeo; } -- 2.53.0