qemu: parse: Validate that the VM has at least one cpu

Libvirt's code relies on this fact so don't allow parsing a command line
which would have none.

Libvirtd would crash in the post parse callback on such config.

diff --git a/src/qemu/qemu_parse_command.c b/src/qemu/qemu_parse_command.c
index c3b27aac8eab14a485658360b26391d830a03fca..b19c523939680e1f59cfa0c5b29053c7254cdfe9 100644 (file)
--- a/src/qemu/qemu_parse_command.c
+++ b/src/qemu/qemu_parse_command.c
@@ -1702,6 +1702,9 @@ qemuParseCommandLineSmp(virDomainDefPtr dom,
     if (maxcpus == 0)
         maxcpus = vcpus;
 
+    if (maxcpus == 0)
+        goto syntax;
+
     if (virDomainDefSetVcpusMax(dom, maxcpus, xmlopt) < 0)
         goto error;