From patchwork Wed Sep 8 07:28:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nilesh Javali X-Patchwork-Id: 508202 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, 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 D7816C433EF for ; Wed, 8 Sep 2021 07:30:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C1B8D61051 for ; Wed, 8 Sep 2021 07:30:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350612AbhIHHbl (ORCPT ); Wed, 8 Sep 2021 03:31:41 -0400 Received: from mx0b-0016f401.pphosted.com ([67.231.156.173]:21538 "EHLO mx0b-0016f401.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350259AbhIHHbf (ORCPT ); Wed, 8 Sep 2021 03:31:35 -0400 Received: from pps.filterd (m0045851.ppops.net [127.0.0.1]) by mx0b-0016f401.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1882s7OK018373; Wed, 8 Sep 2021 00:30:23 -0700 Received: from dc5-exch02.marvell.com ([199.233.59.182]) by mx0b-0016f401.pphosted.com with ESMTP id 3axcmjaeay-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Wed, 08 Sep 2021 00:30:22 -0700 Received: from DC5-EXCH01.marvell.com (10.69.176.38) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server (TLS) id 15.0.1497.18; Wed, 8 Sep 2021 00:30:20 -0700 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server id 15.0.1497.18 via Frontend Transport; Wed, 8 Sep 2021 00:30:20 -0700 Received: from dut1171.mv.qlogic.com (unknown [10.112.88.18]) by maili.marvell.com (Postfix) with ESMTP id D81033F7099; Wed, 8 Sep 2021 00:30:19 -0700 (PDT) Received: from dut1171.mv.qlogic.com (localhost [127.0.0.1]) by dut1171.mv.qlogic.com (8.14.7/8.14.7) with ESMTP id 1887UJpY010142; Wed, 8 Sep 2021 00:30:19 -0700 Received: (from root@localhost) by dut1171.mv.qlogic.com (8.14.7/8.14.7/Submit) id 1887UJju010141; Wed, 8 Sep 2021 00:30:19 -0700 From: Nilesh Javali To: , CC: , , , Subject: [PATCH 06/10] qla2xxx: Fix kernel crash when accessing port_speed sysfs file Date: Wed, 8 Sep 2021 00:28:42 -0700 Message-ID: <20210908072846.10011-7-njavali@marvell.com> X-Mailer: git-send-email 2.12.0 In-Reply-To: <20210908072846.10011-1-njavali@marvell.com> References: <20210908072846.10011-1-njavali@marvell.com> MIME-Version: 1.0 X-Proofpoint-GUID: AThJnKH7C58r7aAgqI2xO6mxV7SLvo4U X-Proofpoint-ORIG-GUID: AThJnKH7C58r7aAgqI2xO6mxV7SLvo4U X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1, Aquarius:18.0.790, Hydra:6.0.391, FMLib:17.0.607.475 definitions=2021-09-08_02,2021-09-07_02,2020-04-07_01 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Arun Easi Kernel crashes when accessing port_speed sysfs file. The issue happens on a CNA when the local array was accessed beyond bounds. Fix this by changing the lookup. BUG: unable to handle kernel paging request at 0000000000004000 PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 15 PID: 455213 Comm: sosreport Kdump: loaded Not tainted 4.18.0-305.7.1.el8_4.x86_64 #1 RIP: 0010:string_nocheck+0x12/0x70 Code: 00 00 4c 89 e2 be 20 00 00 00 48 89 ef e8 86 9a 00 00 4c 01 e3 eb 81 90 49 89 f2 48 89 ce 48 89 f8 48 c1 fe 30 66 85 f6 74 4f <44> 0f b6 0a 45 84 c9 74 46 83 ee 01 41 b8 01 00 00 00 48 8d 7c 37 RSP: 0018:ffffb5141c1afcf0 EFLAGS: 00010286 RAX: ffff8bf4009f8000 RBX: ffff8bf4009f9000 RCX: ffff0a00ffffff04 RDX: 0000000000004000 RSI: ffffffffffffffff RDI: ffff8bf4009f8000 RBP: 0000000000004000 R08: 0000000000000001 R09: ffffb5141c1afb84 R10: ffff8bf4009f9000 R11: ffffb5141c1afce6 R12: ffff0a00ffffff04 R13: ffffffffc08e21aa R14: 0000000000001000 R15: ffffffffc08e21aa FS: 00007fc4ebfff700(0000) GS:ffff8c717f7c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000004000 CR3: 000000edfdee6006 CR4: 00000000001706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: string+0x40/0x50 vsnprintf+0x33c/0x520 scnprintf+0x4d/0x90 qla2x00_port_speed_show+0xb5/0x100 [qla2xxx] dev_attr_show+0x1c/0x40 sysfs_kf_seq_show+0x9b/0x100 seq_read+0x153/0x410 vfs_read+0x91/0x140 ksys_read+0x4f/0xb0 do_syscall_64+0x5b/0x1a0 entry_SYSCALL_64_after_hwframe+0x65/0xca Signed-off-by: Arun Easi Signed-off-by: Nilesh Javali Reviewed-by: Himanshu Madhani --- drivers/scsi/qla2xxx/qla_attr.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c index d09776b77af2..cb5f2ecb652d 100644 --- a/drivers/scsi/qla2xxx/qla_attr.c +++ b/drivers/scsi/qla2xxx/qla_attr.c @@ -1868,6 +1868,18 @@ qla2x00_port_speed_store(struct device *dev, struct device_attribute *attr, return strlen(buf); } +static const struct { + u16 rate; + char *str; +} port_speed_str[] = { + { PORT_SPEED_4GB, "4" }, + { PORT_SPEED_8GB, "8" }, + { PORT_SPEED_16GB, "16" }, + { PORT_SPEED_32GB, "32" }, + { PORT_SPEED_64GB, "64" }, + { PORT_SPEED_10GB, "10" }, +}; + static ssize_t qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -1875,7 +1887,8 @@ qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr, struct scsi_qla_host *vha = shost_priv(dev_to_shost(dev)); struct qla_hw_data *ha = vha->hw; ssize_t rval; - char *spd[7] = {"0", "0", "0", "4", "8", "16", "32"}; + u16 i; + char *speed = "Unknown"; rval = qla2x00_get_data_rate(vha); if (rval != QLA_SUCCESS) { @@ -1884,7 +1897,14 @@ qla2x00_port_speed_show(struct device *dev, struct device_attribute *attr, return -EINVAL; } - return scnprintf(buf, PAGE_SIZE, "%s\n", spd[ha->link_data_rate]); + for (i = 0; i < ARRAY_SIZE(port_speed_str); i++) { + if (port_speed_str[i].rate != ha->link_data_rate) + continue; + speed = port_speed_str[i].str; + break; + } + + return scnprintf(buf, PAGE_SIZE, "%s\n", speed); } static ssize_t