Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753959Ab2JHQSK (ORCPT ); Mon, 8 Oct 2012 12:18:10 -0400 Received: from db3ehsobe006.messaging.microsoft.com ([213.199.154.144]:22072 "EHLO db3outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751589Ab2JHQSH convert rfc822-to-8bit (ORCPT ); Mon, 8 Oct 2012 12:18:07 -0400 X-Forefront-Antispam-Report: CIP:198.70.193.61;KIP:(null);UIP:(null);IPV:NLI;H:avexcashub1.qlogic.com;RD:avexcashub1.qlogic.com;EFVD:NLI X-SpamScore: -2 X-BigFish: VPS-2(zz1432I4015Izz1202h1d1ah1d2ahzz8275bhz2fh2a8h668h839h946he5bhf0ah107ah1288h12a5h12a9h12bdh137ah13b6h1441h1155h) From: Saurav Kashyap To: Paul Bolle , Andrew Vasquez , "James E.J. Bottomley" , Dept-Eng Linux Driver , Rolf Eike Beer CC: "linux-scsi@vger.kernel.org" , linux-kernel Date: Mon, 8 Oct 2012 11:15:28 -0500 Subject: Re: [PATCH v3] qla2xxx: silence two GCC warnings Thread-Topic: [PATCH v3] qla2xxx: silence two GCC warnings Thread-Index: Ac2lcCJ4w8erwjyrTDOsh9kuPUJGiQ== Message-ID: In-Reply-To: <1349439810.1491.18.camel@x61.thuisdomein> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.10.0.110310 acceptlanguage: en-US Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: qlogic.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3701 Lines: 87 Acked-by: Saurav Kashyap Thanks, ~Saurav >Compiling qla_gs.o (part of the qla2xxx module) triggers two GCC >warnings: > drivers/scsi/qla2xxx/qla_gs.c: In function ?qla2x00_fdmi_rhba?: > drivers/scsi/qla2xxx/qla_gs.c:1339:7: warning: array subscript is >above array bounds [-Warray-bounds] > drivers/scsi/qla2xxx/qla_gs.c: In function ?qla2x00_fdmi_register?: > drivers/scsi/qla2xxx/qla_gs.c:1663:15: warning: array subscript is >above array bounds [-Warray-bounds] > >It seems that the sequence of a strcpy followed by a strlen confuses GCC >when it is keeping track of array bounds here. (It is not clear to me >which array triggers this warning and by how much GCC thinks the >subscript is above its bounds. Neither is it clear to me why comparable >code in these two functions doesn't trigger this warning.) > >An easy way to silence these warnings is to use preprocessor macros and >strncpy, as that apparently gives GCC enough information to keep track >of array bounds. > >Signed-off-by: Paul Bolle >--- >0) Updated for Saurav's request to use strncpy(). > >1) Still only compile tested. > > drivers/scsi/qla2xxx/qla_def.h | 1 + > drivers/scsi/qla2xxx/qla_gs.c | 8 ++++---- > 2 files changed, 5 insertions(+), 4 deletions(-) > >diff --git a/drivers/scsi/qla2xxx/qla_def.h >b/drivers/scsi/qla2xxx/qla_def.h >index 39007f5..8895038 100644 >--- a/drivers/scsi/qla2xxx/qla_def.h >+++ b/drivers/scsi/qla2xxx/qla_def.h >@@ -37,6 +37,7 @@ > #include "qla_nx.h" > #define QLA2XXX_DRIVER_NAME "qla2xxx" > #define QLA2XXX_APIDEV "ql2xapidev" >+#define QLA2XXX_MANUFACTURER "QLogic Corporation" > > /* > * We have MAILBOX_REGISTER_COUNT sized arrays in a few places, >diff --git a/drivers/scsi/qla2xxx/qla_gs.c b/drivers/scsi/qla2xxx/qla_gs.c >index 05260d2..824cbcf 100644 >--- a/drivers/scsi/qla2xxx/qla_gs.c >+++ b/drivers/scsi/qla2xxx/qla_gs.c >@@ -1325,8 +1325,8 @@ qla2x00_fdmi_rhba(scsi_qla_host_t *vha) > /* Manufacturer. */ > eiter = (struct ct_fdmi_hba_attr *) (entries + size); > eiter->type = __constant_cpu_to_be16(FDMI_HBA_MANUFACTURER); >- strcpy(eiter->a.manufacturer, "QLogic Corporation"); >- alen = strlen(eiter->a.manufacturer); >+ alen = strlen(QLA2XXX_MANUFACTURER); >+ strncpy(eiter->a.manufacturer, QLA2XXX_MANUFACTURER, alen + 1); > alen += (alen & 3) ? (4 - (alen & 3)) : 4; > eiter->len = cpu_to_be16(4 + alen); > size += 4 + alen; >@@ -1646,8 +1646,8 @@ qla2x00_fdmi_rpa(scsi_qla_host_t *vha) > /* OS device name. */ > eiter = (struct ct_fdmi_port_attr *) (entries + size); > eiter->type = __constant_cpu_to_be16(FDMI_PORT_OS_DEVICE_NAME); >- strcpy(eiter->a.os_dev_name, QLA2XXX_DRIVER_NAME); >- alen = strlen(eiter->a.os_dev_name); >+ alen = strlen(QLA2XXX_DRIVER_NAME); >+ strncpy(eiter->a.os_dev_name, QLA2XXX_DRIVER_NAME, alen + 1); > alen += (alen & 3) ? (4 - (alen & 3)) : 4; > eiter->len = cpu_to_be16(4 + alen); > size += 4 + alen; >-- >1.7.11.4 > > This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. 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