From nobody Fri Sep 5 20:17:57 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42640C32772 for ; Tue, 23 Aug 2022 12:00:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1358957AbiHWL77 (ORCPT ); Tue, 23 Aug 2022 07:59:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1359404AbiHWL4u (ORCPT ); Tue, 23 Aug 2022 07:56:50 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C3E79413D; Tue, 23 Aug 2022 02:34:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id EA15FCE1B5A; Tue, 23 Aug 2022 09:33:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E9EBC433C1; Tue, 23 Aug 2022 09:33:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661247230; bh=vn8sRngeekKj5Hiwjb/2YEw2w2BCxvYLhU5ASInCkPg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xHEhI34vpkQp799nP6gU4cqjZn0T5s5tMx7j/v8zeav6qSHL2yh0xhMmsm+36Ykak h3Q1MwbILDbQtSt/MbIh30IxtJ0xyaqSSJXMK3VVoa2qqNtYPaWDsCRBvP0kx/yqe6 5gjTt41SKkyZOI/9x5+XQVk1jcpooxRRekp2/Ak8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Justin Tee , James Smart , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.4 358/389] scsi: lpfc: Prevent buffer overflow crashes in debugfs with malformed user input Date: Tue, 23 Aug 2022 10:27:16 +0200 Message-Id: <20220823080130.507542548@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080115.331990024@linuxfoundation.org> References: <20220823080115.331990024@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: James Smart [ Upstream commit f8191d40aa612981ce897e66cda6a88db8df17bb ] Malformed user input to debugfs results in buffer overflow crashes. Adapt input string lengths to fit within internal buffers, leaving space for NULL terminators. Link: https://lore.kernel.org/r/20220701211425.2708-3-jsmart2021@gmail.com Co-developed-by: Justin Tee Signed-off-by: Justin Tee Signed-off-by: James Smart Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/lpfc/lpfc_debugfs.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debu= gfs.c index e15bb3dfe995..69551132f304 100644 --- a/drivers/scsi/lpfc/lpfc_debugfs.c +++ b/drivers/scsi/lpfc/lpfc_debugfs.c @@ -2402,8 +2402,8 @@ lpfc_debugfs_multixripools_write(struct file *file, c= onst char __user *buf, struct lpfc_sli4_hdw_queue *qp; struct lpfc_multixri_pool *multixri_pool; =20 - if (nbytes > 64) - nbytes =3D 64; + if (nbytes > sizeof(mybuf) - 1) + nbytes =3D sizeof(mybuf) - 1; =20 /* Protect copy from user */ if (!access_ok(buf, nbytes)) @@ -2487,8 +2487,8 @@ lpfc_debugfs_nvmestat_write(struct file *file, const = char __user *buf, if (!phba->targetport) return -ENXIO; =20 - if (nbytes > 64) - nbytes =3D 64; + if (nbytes > sizeof(mybuf) - 1) + nbytes =3D sizeof(mybuf) - 1; =20 memset(mybuf, 0, sizeof(mybuf)); =20 @@ -2629,8 +2629,8 @@ lpfc_debugfs_nvmektime_write(struct file *file, const= char __user *buf, char mybuf[64]; char *pbuf; =20 - if (nbytes > 64) - nbytes =3D 64; + if (nbytes > sizeof(mybuf) - 1) + nbytes =3D sizeof(mybuf) - 1; =20 memset(mybuf, 0, sizeof(mybuf)); =20 @@ -2757,8 +2757,8 @@ lpfc_debugfs_nvmeio_trc_write(struct file *file, cons= t char __user *buf, char mybuf[64]; char *pbuf; =20 - if (nbytes > 63) - nbytes =3D 63; + if (nbytes > sizeof(mybuf) - 1) + nbytes =3D sizeof(mybuf) - 1; =20 memset(mybuf, 0, sizeof(mybuf)); =20 @@ -2863,8 +2863,8 @@ lpfc_debugfs_cpucheck_write(struct file *file, const = char __user *buf, char *pbuf; int i, j; =20 - if (nbytes > 64) - nbytes =3D 64; + if (nbytes > sizeof(mybuf) - 1) + nbytes =3D sizeof(mybuf) - 1; =20 memset(mybuf, 0, sizeof(mybuf)); =20 --=20 2.35.1