virFileNBDDeviceAssociate: Avoid use of uninitialized variable

This fixes CVE-2013-4297.

Thanks: Michal Privoznik

debian/patches/series

@@ -12,3 +12,4 @@ debian/Debianize-systemd-service-files.patch
 Allow-xen-toolstack-to-find-it-s-binaries.patch
 Fix-make-check-not-finding-finding-the-libvirtd-lens.patch
 Parse-AM_LDFLAGS-to-driver-modules-too.patch
+virFileNBDDeviceAssociate-Avoid-use-of-uninitialized.patch

debian/patches/virFileNBDDeviceAssociate-Avoid-use-of-uninitialized.patch

+From: Michal Privoznik <mprivozn@redhat.com>
+Date: Tue, 3 Sep 2013 18:56:06 +0200
+Subject: virFileNBDDeviceAssociate: Avoid use of uninitialized variable
+
+The @qemunbd variable can be used uninitialized.
+---
+ src/util/virfile.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/util/virfile.c b/src/util/virfile.c
+index 2b07ac9..7af0843 100644
+--- a/src/util/virfile.c
++++ b/src/util/virfile.c
+@@ -732,7 +732,7 @@ int virFileNBDDeviceAssociate(const char *file,
+                               char **dev)
+ {
+     char *nbddev;
+-    char *qemunbd;
++    char *qemunbd = NULL;
+     virCommandPtr cmd = NULL;
+     int ret = -1;
+     const char *fmtstr = NULL;