[libvirt] [PATCH 2/4] qemuDomainAttachDeviceLiveAndConfig: Don't overwrite @ret

[Michal Privoznik]

If we're attaching a device to both inactive and live XML then
@ret is overwritten which may result in incorrect return value.
For instance, if attaching to inactive XML succeeds, @ret is
assigned value of zero and control proceeds to attaching the
device to live XML. Here, if say
virDomainDeviceValidateAliasForHotplug() fails the control jumps
over to 'cleanup' label and zero is returned indicating success.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/qemu/qemu_driver.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 30fc335883..2b2d531441 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -8652,9 +8652,9 @@ qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
                                          false) < 0)
             goto cleanup;
 
-        if ((ret = qemuDomainAttachDeviceConfig(vmdef, devConf, caps,
-                                                parse_flags,
-                                                driver->xmlopt)) < 0)
+        if (qemuDomainAttachDeviceConfig(vmdef, devConf, caps,
+                                         parse_flags,
+                                         driver->xmlopt) < 0)
             goto cleanup;
     }
 
@@ -8671,28 +8671,27 @@ qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
                                          true) < 0)
             goto cleanup;
 
-        if ((ret = qemuDomainAttachDeviceLive(vm, devLive, driver)) < 0)
+        if (qemuDomainAttachDeviceLive(vm, devLive, driver) < 0)
             goto cleanup;
         /*
          * update domain status forcibly because the domain status may be
          * changed even if we failed to attach the device. For example,
          * a new controller may be created.
          */
-        if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm, driver->caps) < 0) {
-            ret = -1;
+        if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm, driver->caps) < 0)
             goto cleanup;
-        }
     }
 
     /* Finally, if no error until here, we can save config. */
     if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
-        ret = virDomainSaveConfig(cfg->configDir, driver->caps, vmdef);
-        if (!ret) {
-            virDomainObjAssignDef(vm, vmdef, false, NULL);
-            vmdef = NULL;
-        }
+        if (virDomainSaveConfig(cfg->configDir, driver->caps, vmdef) < 0)
+            goto cleanup;
+
+        virDomainObjAssignDef(vm, vmdef, false, NULL);
+        vmdef = NULL;
     }
 
+    ret = 0;
  cleanup:
     virDomainDefFree(vmdef);
     virDomainDeviceDefFree(devConf);
-- 
2.21.0