From patchwork Wed Aug 26 12:02:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 264892 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD560C433E1 for ; Wed, 26 Aug 2020 12:03:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 933D02087D for ; Wed, 26 Aug 2020 12:03:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598443426; bh=nHZ1XCR0ar56nN1+7P20uXLCe6Zcn+8Xf7Xo61kQ/uI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SogrgMeHiOQIWhiy8zOoKF8qJyUcWTOn/b5zjTVfkxuFzu/6vIXemzD0orExBCGtk 8YrIQVlZJRuwoeSmomNB6R7Zhv7olWXe3ckUN+q6fxj5b4ekTDofrGhQOS+gBHUmxG luAJ/tzhq9HBdGhnFDsIBxVTkzcV9m/2oUMT9B7E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729366AbgHZMDo (ORCPT ); Wed, 26 Aug 2020 08:03:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:38932 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729544AbgHZMDl (ORCPT ); Wed, 26 Aug 2020 08:03:41 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9F05D20838; Wed, 26 Aug 2020 12:03:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598443421; bh=nHZ1XCR0ar56nN1+7P20uXLCe6Zcn+8Xf7Xo61kQ/uI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qH4n7a/u3lahZK23N6J1XU+Ou/HtAPWraI5ux6U2H+RHcmW2aY+ezGLIGVRC1kOJA 9gvi+o+9jMdL9SXfCrLuO++jLRBsX9qntpnex0n68SRRwL44uFgF+UFyTJL1sL4ZsP k5N+TzZplZuUSBZRmnyRy5Zcg8550mImnHPWbPx0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+f31428628ef672716ea8@syzkaller.appspotmail.com, Necip Fazil Yildiran , Dmitry Vyukov , "David S. Miller" Subject: [PATCH 5.8 04/16] net: qrtr: fix usage of idr in port assignment to socket Date: Wed, 26 Aug 2020 14:02:41 +0200 Message-Id: <20200826114911.435453704@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200826114911.216745274@linuxfoundation.org> References: <20200826114911.216745274@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Necip Fazil Yildiran [ Upstream commit 8dfddfb79653df7c38a9c8c4c034f242a36acee9 ] Passing large uint32 sockaddr_qrtr.port numbers for port allocation triggers a warning within idr_alloc() since the port number is cast to int, and thus interpreted as a negative number. This leads to the rejection of such valid port numbers in qrtr_port_assign() as idr_alloc() fails. To avoid the problem, switch to idr_alloc_u32() instead. Fixes: bdabad3e363d ("net: Add Qualcomm IPC router") Reported-by: syzbot+f31428628ef672716ea8@syzkaller.appspotmail.com Signed-off-by: Necip Fazil Yildiran Reviewed-by: Dmitry Vyukov Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/qrtr/qrtr.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) --- a/net/qrtr/qrtr.c +++ b/net/qrtr/qrtr.c @@ -692,23 +692,25 @@ static void qrtr_port_remove(struct qrtr */ static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) { + u32 min_port; int rc; mutex_lock(&qrtr_port_lock); if (!*port) { - rc = idr_alloc(&qrtr_ports, ipc, - QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1, - GFP_ATOMIC); - if (rc >= 0) - *port = rc; + min_port = QRTR_MIN_EPH_SOCKET; + rc = idr_alloc_u32(&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)) { rc = -EACCES; } else if (*port == QRTR_PORT_CTRL) { - rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC); + min_port = 0; + rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, 0, GFP_ATOMIC); } else { - rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC); - if (rc >= 0) - *port = rc; + min_port = *port; + rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, *port, GFP_ATOMIC); + if (!rc) + *port = min_port; } mutex_unlock(&qrtr_port_lock);