From patchwork Sun Aug 30 14:38:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 11745135 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B394C739 for ; Sun, 30 Aug 2020 14:39:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9BD0020BED for ; Sun, 30 Aug 2020 14:39:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="iQ2lK9V5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726946AbgH3Oj2 (ORCPT ); Sun, 30 Aug 2020 10:39:28 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:47891 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726264AbgH3OjW (ORCPT ); Sun, 30 Aug 2020 10:39:22 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1598798361; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=BG5Bli+klgMbg2PSkB4G0lK79qcXpmQXHNwoceerTbI=; b=iQ2lK9V5u9Ekul1ZfLlNwstLftiQoSovAtoqfkT21SkEQMShR5JtmnLqWVoOfTqyCyX4Snsc OLv6xPplRQptEKdp347ngHC7bUzIHs2eE5Cg4vNAkPbtxQewuRAvJIoOF0nnmY4knbEQ7I0p qU/b6zzy3GX7/Eh86UnvOKfZ0Qo= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n02.prod.us-east-1.postgun.com with SMTP id 5f4bb9fe63431d1144a3fb01 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Sun, 30 Aug 2020 14:38:54 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 65027C43387; Sun, 30 Aug 2020 14:38:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 Received: from deesin-linux.qualcomm.com (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: deesin) by smtp.codeaurora.org (Postfix) with ESMTPSA id B36ACC433C6; Sun, 30 Aug 2020 14:38:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B36ACC433C6 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=deesin@codeaurora.org From: Deepak Kumar Singh To: bjorn.andersson@linaro.org, clew@codeaurora.org Cc: mathieu.poirier@linaro.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, "David S. Miller" , Jakub Kicinski , Manivannan Sadhasivam , Carl Huang , Necip Fazil Yildiran , netdev@vger.kernel.org (open list:NETWORKING [GENERAL]) Subject: [PATCH V1 3/4] net: qrtr: Change port allocation to use cyclic idr Date: Sun, 30 Aug 2020 20:08:11 +0530 Message-Id: <1598798292-5971-4-git-send-email-deesin@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1598798292-5971-1-git-send-email-deesin@codeaurora.org> References: <1598798292-5971-1-git-send-email-deesin@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Chris Lew There is a race for clients that open sockets before the control port is bound. If a client gets an idr that was allocated before the control port is bound, there is a chance the previous address owner sent lookup packets to the control port. The new address owner will get residual responses to this the lookup packets. Change the idr_alloc to idr_alloc_cyclic so new idr's are allocated instead of trying to reuse the freed idrs. Reported-by: kernel test robot --- net/qrtr/qrtr.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c index 4496b75..e2dd38e 100644 --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -744,7 +744,8 @@ static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) mutex_lock(&qrtr_port_lock); if (!*port) { min_port = QRTR_MIN_EPH_SOCKET; - rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, QRTR_MAX_EPH_SOCKET, GFP_ATOMIC); + rc = idr_alloc_cyclic(&qrtr_ports, ipc, &min_port, + QRTR_MAX_EPH_SOCKET, GFP_ATOMIC); if (!rc) *port = min_port; } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { @@ -754,7 +755,8 @@ static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, 0, GFP_ATOMIC); } else { min_port = *port; - rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, *port, GFP_ATOMIC); + rc = idr_alloc_cyclic(&qrtr_ports, ipc, &min_port, + *port, GFP_ATOMIC); if (!rc) *port = min_port; }