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Violators will be prosecuted; Mon, 28 Aug 2017 22:56:39 +1000 Received: from d23av03.au.ibm.com (d23av03.au.ibm.com [9.190.234.97]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v7SCtNsR31588532 for ; Mon, 28 Aug 2017 22:55:23 +1000 Received: from d23av03.au.ibm.com (localhost [127.0.0.1]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v7SCtFaL026641 for ; Mon, 28 Aug 2017 22:55:15 +1000 Received: from oc1548405160.ibm.com ([9.79.182.7]) by d23av03.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v7SCtAvw026428 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 28 Aug 2017 22:55:14 +1000 From: Seeteena Thoufeek To: qemu-devel@nongnu.org, pbonzini@redhat.com Date: Mon, 28 Aug 2017 18:25:17 +0530 X-Mailer: git-send-email 1.8.3.1 X-TM-AS-MML: disable x-cbid: 17082812-0040-0000-0000-00000351C5A8 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17082812-0041-0000-0000-00000CCFBCBD Message-Id: <1503924917-12687-1-git-send-email-s1seetee@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-08-28_07:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1708280209 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 X-Mailman-Approved-At: Mon, 28 Aug 2017 09:10:07 -0400 Subject: [Qemu-devel] [PATCH v2] qemu crashes when a negative number used for 'maxcpus' 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: s1seetee@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Reported-by: R.Nageswara Sastry Reviewed-by: Bharata B Rao ---Steps to Reproduce--- When passed a negative number to 'maxcpus' parameter, Qemu aborts with a core dump. Run the following command with maxcpus argument as negative number ppc64-softmmu/qemu-system-ppc64 --nographic -vga none -machine pseries,accel=3Dkvm,kvm-type=3DHV -m size=3D200g -device virtio-blk-pci, drive=3Drootdisk -drive file=3D/home/images/pegas-1.0-ppc64le.qcow2, if=3Dnone,cache=3Dnone,id=3Drootdisk,format=3Dqcow2 -monitor telnet :127.0.0.1:1234,server,nowait -net nic,model=3Dvirtio -net user -redir tcp:2000::22 -device nec-usb-xhci -smp 8,cores=3D1, threads=3D1,maxcpus=3D-12 (process:12149): GLib-ERROR **: gmem.c:130: failed to allocate 18446744073709550568 bytes Trace/breakpoint trap Reported-by: R.Nageswara Sastry Signed-off-by: Seeteena Thoufeek Reviewed-by: Bharata B Rao --- vl.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/vl.c b/vl.c index 8e247cc..042714f 100644 --- a/vl.c +++ b/vl.c @@ -1244,6 +1244,11 @@ static void smp_parse(QemuOpts *opts) } =20 max_cpus =3D qemu_opt_get_number(opts, "maxcpus", cpus); + + if (max_cpus < 0) { + error_report("Invalid max_cpus : %d", max_cpus); + exit(1); + } =20 if (max_cpus < cpus) { error_report("maxcpus must be equal to or greater than smp"); --=20 1.8.3.1