[libvirt] [PATCH v3 1/4] qemu: Fix segfault when parsing private domain data

[Martin Kletzander]

When parsing private domain data, there are two paths that are flawed.
They are both error paths, just from different parts of the function.
One of them can call free() on an uninitialized pointer.  Initialization
to NULL is enough here.  The other one is a bit trickier to explain, but
as easy as the first one to fix.  We create capabilities, parse them and
then assign them into the private data pointer inside the domain object.
If, however, we get to fail from now on, the error path calls unrefs the
capabilities and then, when the domain object is being cleaned,
qemuDomainObjPrivateFree() tries to unref them as well.  That causes a
segfault.  Settin the pointer to NULL upon successful addition to the
private data is enough.

Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
 src/qemu/qemu_domain.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index abf52c9c38fa..8fe7c75d19c9 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -627,7 +627,7 @@ qemuDomainObjPrivateXMLParse(xmlXPathContextPtr ctxt,
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
     char *monitorpath;
-    char *tmp;
+    char *tmp = NULL;
     int n;
     size_t i;
     xmlNodePtr *nodes = NULL;
@@ -715,6 +715,7 @@ qemuDomainObjPrivateXMLParse(xmlXPathContextPtr ctxt,
         }

         priv->qemuCaps = qemuCaps;
+        qemuCaps = NULL;
     }
     VIR_FREE(nodes);

-- 
2.5.0