From nobody Fri Dec 19 20:11:21 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1554154205884689.5291577029323; Mon, 1 Apr 2019 14:30:05 -0700 (PDT) Received: from localhost ([127.0.0.1]:44859 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB4VG-0002jS-Qr for importer@patchew.org; Mon, 01 Apr 2019 17:30:02 -0400 Received: from eggs.gnu.org ([209.51.188.92]:41110) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB44n-0001as-PH for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:02:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hB44m-0003aT-Pl for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:02:41 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:48240) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hB44m-0003TJ-BS for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:02:40 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x31L29rA119029 for ; Mon, 1 Apr 2019 17:02:29 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rkqt605h5-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 01 Apr 2019 17:02:27 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 1 Apr 2019 22:02:23 +0100 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x31L2Mbt30212350 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Apr 2019 21:02:22 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 99F9178063; Mon, 1 Apr 2019 21:02:22 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 672FC78060; Mon, 1 Apr 2019 21:02:22 +0000 (GMT) Received: from localhost (unknown [9.80.94.43]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 1 Apr 2019 21:02:22 +0000 (GMT) From: Michael Roth To: qemu-devel@nongnu.org Date: Mon, 1 Apr 2019 15:59:21 -0500 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> References: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19040121-0004-0000-0000-000014F71F2C X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010857; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000283; SDB=6.01182941; UDB=6.00619269; IPR=6.00963684; MB=3.00026249; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-01 21:02:25 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040121-0005-0000-0000-00008B1BBF09 Message-Id: <20190401210011.16009-48-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-01_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904010136 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH 47/97] pcnet: fix possible buffer overflow X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang , qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Jason Wang In pcnet_receive(), we try to assign size_ to size which converts from size_t to integer. This will cause troubles when size_ is greater INT_MAX, this will lead a negative value in size and it can then pass the check of size < MIN_BUF_SIZE which may lead out of bound access for both buf and buf1. Fixing by converting the type of size to size_t. CC: qemu-stable@nongnu.org Reported-by: Daniel Shapira Reviewed-by: Michael S. Tsirkin Signed-off-by: Jason Wang (cherry picked from commit b1d80d12c5f7ff081bb80ab4f4241d4248691192) Signed-off-by: Michael Roth --- hw/net/pcnet.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/net/pcnet.c b/hw/net/pcnet.c index 0c44554168..d9ba04bdfc 100644 --- a/hw/net/pcnet.c +++ b/hw/net/pcnet.c @@ -988,14 +988,14 @@ ssize_t pcnet_receive(NetClientState *nc, const uint8= _t *buf, size_t size_) uint8_t buf1[60]; int remaining; int crc_err =3D 0; - int size =3D size_; + size_t size =3D size_; =20 if (CSR_DRX(s) || CSR_STOP(s) || CSR_SPND(s) || !size || (CSR_LOOP(s) && !s->looptest)) { return -1; } #ifdef PCNET_DEBUG - printf("pcnet_receive size=3D%d\n", size); + printf("pcnet_receive size=3D%zu\n", size); #endif =20 /* if too small buffer, then expand it */ --=20 2.17.1