[libvirt] [PATCH] Fix a crash when restarting libvirtd.

[Chris Lalancette]

If you shutdown libvirtd while a domain with PCI
devices is running, then try to restart libvirtd,
libvirtd will crash.

This happens because qemuUpdateActivePciHostdevs() is calling
pciDeviceListSteal() with a dev of 0x0 (NULL), and then trying
to dereference it.  This patch fixes it up so that
qemuUpdateActivePciHostdevs() steals the devices after first
Get()'ting them, avoiding the crash.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
---
 src/qemu/qemu_driver.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 55550ef..bbdbe33 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -2147,6 +2147,7 @@ qemuUpdateActivePciHostdevs(struct qemud_driver *driver,
                             virDomainDefPtr def)
 {
     pciDeviceList *pcidevs;
+    int i;
     int ret = -1;
 
     if (!def->nhostdevs)
@@ -2155,8 +2156,9 @@ qemuUpdateActivePciHostdevs(struct qemud_driver *driver,
     if (!(pcidevs = qemuGetPciHostDeviceList(NULL, def)))
         return -1;
 
-    while (pciDeviceListCount(pcidevs) > 0) {
-        pciDevice *dev = pciDeviceListSteal(NULL, pcidevs, 0);
+    for (i = 0; i < pciDeviceListCount(pcidevs); i++) {
+        pciDevice *dev = pciDeviceListGet(pcidevs, i);
+        pciDeviceListSteal(NULL, pcidevs, dev);
         if (pciDeviceListAdd(NULL,
                              driver->activePciHostdevs,
                              dev) < 0) {
-- 
1.6.6