[libvirt] [PATCH] storage: avoid null deref and leak on failure

[Eric Blake <eblake redhat com>]

Detected by clang.  NULL deref added in commit 343a27a (Mar 11),
but leak of voldef present since commit 2cd9b2d (Apr 09).

* src/storage/storage_driver.c (storageVolumeCreateXML): Don't
leak voldef or dereference null volobj.
---
 src/storage/storage_driver.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/storage/storage_driver.c b/src/storage/storage_driver.c
index 1ea5d12..19c7d63 100644
--- a/src/storage/storage_driver.c
+++ b/src/storage/storage_driver.c
@@ -1319,8 +1319,10 @@ storageVolumeCreateXML(virStoragePoolPtr obj,
     pool->volumes.objs[pool->volumes.count++] = voldef;
     volobj = virGetStorageVol(obj->conn, pool->def->name, voldef->name,
                               voldef->key);
+    if (!volobj)
+        goto cleanup;

-    if (volobj && backend->buildVol) {
+    if (backend->buildVol) {
         int buildret;
         virStorageVolDefPtr buildvoldef = NULL;

-- 
1.7.4.4