qemu: Fix job usage in virDomainGetBlockIoTune

CVE-2013-6458

Every API that is going to begin a job should do that before fetching
data from vm->def.

(cherry picked from commit 3b56425938e2f97208d5918263efa0d6439e4ecd)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 3a010bcc892971ef73e56a52b25076ef976e9fe1..91a40db6fd55c2826067ced5c4129b63ca367bbc 100644 (file)
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -15074,12 +15074,6 @@ qemuDomainGetBlockIoTune(virDomainPtr dom,
         goto cleanup;
     }
 
-    device = qemuDiskPathToAlias(vm, disk, NULL);
-
-    if (!device) {
-        goto cleanup;
-    }
-
     if (qemuDomainObjBeginJob(driver, vm, QEMU_JOB_MODIFY) < 0)
         goto cleanup;
 
@@ -15087,6 +15081,11 @@ qemuDomainGetBlockIoTune(virDomainPtr dom,
                                         &persistentDef) < 0)
         goto endjob;
 
+    device = qemuDiskPathToAlias(vm, disk, NULL);
+    if (!device) {
+        goto endjob;
+    }
+
     if (flags & VIR_DOMAIN_AFFECT_LIVE) {
         priv = vm->privateData;
         qemuDomainObjEnterMonitor(driver, vm);