[libvirt] [PATCH] qemu: Avoid dereference of NULL pointer

[Peter Krempa]

If something fails while initializing qemu job object in
qemuDomainObjPrivateAlloc(), memory to the private pointer is freed, but
after that, the pointer is still dereferenced, which may result in a
segfault.

* qemuDomainObjPrivateAlloc() - Don't dereference NULL pointer.
---
I added the label and jump with future expansions in mind, as I've
found this bug while modifying said function.

 src/qemu/qemu_domain.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 3e755d7..d33d1d9 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -214,11 +214,15 @@ static void *qemuDomainObjPrivateAlloc(void)
         return NULL;

     if (qemuDomainObjInitJob(priv) < 0)
-        VIR_FREE(priv);
+        goto error;

     priv->migMaxBandwidth = QEMU_DOMAIN_DEFAULT_MIG_BANDWIDTH_MAX;

     return priv;
+
+error:
+    VIR_FREE(priv);
+    return NULL;
 }

 static void qemuDomainObjPrivateFree(void *data)
-- 
1.7.3.4