[libvirt] [PATCH] qemu: avoid dereferencing a NULL pointer

[ajia at redhat.com]

From: Alex Jia <ajia at redhat.com>

* src/qemu/qemu_hostdev.c: function 'pciDeviceListFind' probably explicitly
  returns null, however, the function 'pciDeviceSetUsedBy' directly uses it
  without any judgement.

Signed-off-by: Alex Jia <ajia at redhat.com>
---
 src/qemu/qemu_hostdev.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_hostdev.c b/src/qemu/qemu_hostdev.c
index c65f6f5..4e148b0 100644
--- a/src/qemu/qemu_hostdev.c
+++ b/src/qemu/qemu_hostdev.c
@@ -227,9 +227,8 @@ int qemuPrepareHostdevPCIDevices(struct qemud_driver *driver,
         pciDevice *dev, *activeDev;
 
         dev = pciDeviceListGet(pcidevs, i);
-        activeDev = pciDeviceListFind(driver->activePciHostdevs, dev);
-
-        pciDeviceSetUsedBy(activeDev, name);
+        if ((activeDev = pciDeviceListFind(driver->activePciHostdevs, dev)))
+            pciDeviceSetUsedBy(activeDev, name);
     }
 
     /* Loop 6: Now steal all the devices from pcidevs */
-- 
1.7.1