From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34634) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dmKUB-0004Qq-3B for qemu-devel@nongnu.org; Mon, 28 Aug 2017 09:53:52 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dmKU5-0006ZF-6r for qemu-devel@nongnu.org; Mon, 28 Aug 2017 09:53:51 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:48308) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dmKU4-0006Yn-UH for qemu-devel@nongnu.org; Mon, 28 Aug 2017 09:53:45 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v7SDrNsN011012 for ; Mon, 28 Aug 2017 09:53:43 -0400 Received: from e23smtp08.au.ibm.com (e23smtp08.au.ibm.com [202.81.31.141]) by mx0a-001b2d01.pphosted.com with ESMTP id 2cmef8p01x-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 28 Aug 2017 09:53:43 -0400 Received: from localhost by e23smtp08.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 28 Aug 2017 23:53:40 +1000 From: Seeteena Thoufeek Date: Mon, 28 Aug 2017 19:23:25 +0530 Message-Id: <1503928405-19960-1-git-send-email-s1seetee@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH v3] qemu crashes when a negative number used for 'maxcpus' List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org, famz@redhat.com, pbonzini@redhat.com Cc: s1seetee@linux.vnet.ibm.com ---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=kvm,kvm-type=HV -m size=200g -device virtio-blk-pci, drive=rootdisk -drive file=/home/images/pegas-1.0-ppc64le.qcow2, if=none,cache=none,id=rootdisk,format=qcow2 -monitor telnet :127.0.0.1:1234,server,nowait -net nic,model=virtio -net user -redir tcp:2000::22 -device nec-usb-xhci -smp 8,cores=1, threads=1,maxcpus=-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, 4 insertions(+), 1 deletion(-) diff --git a/vl.c b/vl.c index 8e247cc..fb45b6d 100644 --- a/vl.c +++ b/vl.c @@ -1244,7 +1244,10 @@ static void smp_parse(QemuOpts *opts) } max_cpus = qemu_opt_get_number(opts, "maxcpus", cpus); - + if (max_cpus <= 0) { + error_report("Invalid max_cpus : %d", max_cpus); + exit(1); + } if (max_cpus < cpus) { error_report("maxcpus must be equal to or greater than smp"); exit(1); -- 1.8.3.1