From patchwork Fri Jan 29 07:17:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ravi Bangoria X-Patchwork-Id: 1433115 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4DRpcw0rz6z9sSC for ; Fri, 29 Jan 2021 18:19:44 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=hyQtaTtD; dkim-atps=neutral Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4DRpcw07GnzDsTL for ; Fri, 29 Jan 2021 18:19:44 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=ravi.bangoria@linux.ibm.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=hyQtaTtD; dkim-atps=neutral Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4DRpb01LlXzDsGJ for ; Fri, 29 Jan 2021 18:18:03 +1100 (AEDT) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 10T725Yh094179; Fri, 29 Jan 2021 02:17:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=I3dtRnZBTCw9snT/6Hmh3n1qri6YelXpcQ7H4Cjw2q8=; b=hyQtaTtDGM8V2SfLqTJNFbKmHLvXmnNcjJeOblba9jJeJx1Om0GoIOQX3Dsiq1ZrzcEu q0axYqfqx28McxW4P49XzrnWH0/OmKulRTOJkk6NCHTV5m1wcclW6lSF/sSORly2lfyb 6xcFxIUugWKQNb3GO8kmtvqFEPwf1RJXTMDNsdJBq1U0jmpCKzubaEM3iShUghWu5cuv xddZsRlkCzQ6Y2l1R5ClBh8Dt2y2lBPAlgfOurfUtbp/iY0x2ZSsfyhOeIDPjhlD3lgL GhWkr3RRG0vtWcXELpssoymHAJ+z3Q+JCUWN1uQZCb5jJyTgcMXTsqQGqHYKR72cZSx6 9A== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 36cc0r2j0a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 29 Jan 2021 02:17:56 -0500 Received: from m0098410.ppops.net (m0098410.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 10T7HtmY006355; Fri, 29 Jan 2021 02:17:55 -0500 Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com with ESMTP id 36cc0r2hyg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 29 Jan 2021 02:17:55 -0500 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 10T7HIjp012671; Fri, 29 Jan 2021 07:17:53 GMT Received: from b06avi18878370.portsmouth.uk.ibm.com (b06avi18878370.portsmouth.uk.ibm.com [9.149.26.194]) by ppma06ams.nl.ibm.com with ESMTP id 368b2h5jvs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 29 Jan 2021 07:17:53 +0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 10T7Hg4p35127772 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 29 Jan 2021 07:17:42 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0D925A4067; Fri, 29 Jan 2021 07:17:50 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 74270A4064; Fri, 29 Jan 2021 07:17:47 +0000 (GMT) Received: from bangoria.ibmuc.com (unknown [9.199.35.112]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 29 Jan 2021 07:17:47 +0000 (GMT) From: Ravi Bangoria To: mpe@ellerman.id.au Subject: [PATCH v2] powerpc/sstep: Fix array out of bound warning Date: Fri, 29 Jan 2021 12:47:45 +0530 Message-Id: <20210129071745.111466-1-ravi.bangoria@linux.ibm.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.343, 18.0.737 definitions=2021-01-29_02:2021-01-28, 2021-01-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxscore=0 mlxlogscore=999 impostorscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 spamscore=0 adultscore=0 clxscore=1015 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2101290034 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: naveen.n.rao@linux.ibm.com, ravi.bangoria@linux.ibm.com, paulus@samba.org, linuxppc-dev@lists.ozlabs.org, jniethe5@gmail.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Compiling kernel with -Warray-bounds throws below warning: In function 'emulate_vsx_store': warning: array subscript is above array bounds [-Warray-bounds] buf.d[2] = byterev_8(reg->d[1]); ~~~~~^~~ buf.d[3] = byterev_8(reg->d[0]); ~~~~~^~~ Fix it by using temporary array variable 'union vsx_reg buf32[]' in that code block. Also, with element_size = 32, 'union vsx_reg *reg' is an array of size 2. So, use 'reg' as an array instead of pointer in the same code block. Fixes: af99da74333b ("powerpc/sstep: Support VSX vector paired storage access instructions") Suggested-by: Naveen N. Rao Signed-off-by: Ravi Bangoria Tested-by: Naveen N. Rao --- v1: http://lore.kernel.org/r/20210115061620.692500-1-ravi.bangoria@linux.ibm.com v1->v2: - Change code only in the affected block arch/powerpc/lib/sstep.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index bf7a7d62ae8b..ede093e96234 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -818,13 +818,15 @@ void emulate_vsx_store(struct instruction_op *op, const union vsx_reg *reg, break; if (rev) { /* reverse 32 bytes */ - buf.d[0] = byterev_8(reg->d[3]); - buf.d[1] = byterev_8(reg->d[2]); - buf.d[2] = byterev_8(reg->d[1]); - buf.d[3] = byterev_8(reg->d[0]); - reg = &buf; + union vsx_reg buf32[2]; + buf32[0].d[0] = byterev_8(reg[1].d[1]); + buf32[0].d[1] = byterev_8(reg[1].d[0]); + buf32[1].d[0] = byterev_8(reg[0].d[1]); + buf32[1].d[1] = byterev_8(reg[0].d[0]); + memcpy(mem, buf32, size); + } else { + memcpy(mem, reg, size); } - memcpy(mem, reg, size); break; case 16: /* stxv, stxvx, stxvl, stxvll */