[libvirt] [PATCH] conf: fix crash when match a network iscsi hostdev with a host iscsi hostdev

https://bugzilla.redhat.com/show_bug.cgi?id=1174053 When we use attach-device to coldplug a network iscsi hostdev, libvirt will check if there is already a device in XML. But if the 'b' is a host iscsi hostdev and 'a' is a network iscsi hostdev , libvirtd will crash in virDomainHostdevMatchSubsysSCSIiSCSI, because 'b' doesn't have a hostname. Add a check in virDomainHostdevMatchSubsys, if the a's protocol and b's protocol is not the same. backtrace like this: 0 0x00007f850d6bc307 in virDomainHostdevMatchSubsysSCSIiSCSI at conf/domain_conf.c:10889 1 virDomainHostdevMatchSubsys at conf/domain_conf.c:10911 2 virDomainHostdevMatch at conf/domain_conf.c:10973 3 virDomainHostdevFind at conf/domain_conf.c:10998 4 0x00007f84f6a10560 in qemuDomainAttachDeviceConfig at qemu/qemu_driver.c:7223 5 qemuDomainAttachDeviceFlags at qemu/qemu_driver.c:7554 Signed-off-by: Luyao Huang <lhuang(a)redhat.com&gt; --- src/conf/domain_conf.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 5cf0b1a..eb63c93 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -11184,7 +11184,9 @@ static int virDomainHostdevMatchSubsys(virDomainHostdevDefPtr a, virDomainHostdevDefPtr b) { - if (a->source.subsys.type != b->source.subsys.type) + if (a->source.subsys.type != b->source.subsys.type || + (a->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_SCSI && + a->source.subsys.u.scsi.protocol != b->source.subsys.u.scsi.protocol)) return 0; switch (a->source.subsys.type) { -- 1.8.3.1