[libvirt] [PATCH] conf: Check for attach disk usage of iothread=0

[John Ferlan]

Since iothreadid = 0 is invalid, we need to check for it when attempting
to add a disk; otherwise, someone would think/believe their attempt to
add an IOThread to the disk would succeed. Luckily other code ignored
things when ->iothread == 0...

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/conf/domain_conf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index b743bdd..10630c0 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -7448,7 +7448,8 @@ virDomainDiskDefParseXML(virDomainXMLOptionPtr xmlopt,
     }
 
     if (driverIOThread) {
-        if (virStrToLong_uip(driverIOThread, NULL, 10, &def->iothread) < 0) {
+        if (virStrToLong_uip(driverIOThread, NULL, 10, &def->iothread) < 0 ||
+            def->iothread == 0) {
             virReportError(VIR_ERR_XML_ERROR,
                            _("Invalid iothread attribute in disk driver "
                              "element: %s"), driverIOThread);
-- 
2.1.0