From d9190851ed9a28e86d5baa3a9872eb6246270cd1 Mon Sep 17 00:00:00 2001
From: Michal Privoznik <mprivozn@redhat.com>
Date: Thu, 16 Apr 2020 14:18:28 +0200
Subject: [PATCH 5/8] qemuDomainDefPostParse: Fail if unable to fill machine
 type

Previously, we used virCapabilitiesDomainDataLookup() to fill
machine type in post parse callback if none was provided in the
domain XML. If machine type couldn't be filled in an error was
reported. After 4a4132b4625 we've changed it to
virQEMUCapsGetPreferredMachine() which returns NULL, but we no
longer report an error and proceed with the post parse callbacks
processing. This may lead to a crash because the code later on
assumes def->os.machine is not NULL.

Fixes: 4a4132b4625

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Mores <pmores@redhat.com>
(cherry-picked from commit 67b973b5)
Signed-off-by: AlexChen <alex.chen@huawei.com>
---
 src/qemu/qemu_domain.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index b1a46478ed..36e6343995 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -4971,6 +4971,14 @@ qemuDomainDefPostParse(virDomainDefPtr def,
     if (!def->os.machine) {
         const char *machine = virQEMUCapsGetPreferredMachine(qemuCaps,
                                                              def->virtType);
+        if (!machine) {
+            virReportError(VIR_ERR_INVALID_ARG,
+                           _("could not get preferred machine for %s type=%s"),
+                           def->emulator,
+                           virDomainVirtTypeToString(def->virtType));
+            return -1;
+        }
+
         def->os.machine = g_strdup(machine);
     }
 
-- 
2.23.0