[PATCH 2/4] snapshot: conf: Avoid dereferencing NULL snapshot parent

[Peter Krempa <pkrempa@xxxxxxxxxx>]

virDomainSnapshotDropParent tried to dereference the parent even in case
the snapshot didn't have a parent. This should not be possible as the
snapshots use metaroot now, but bugs may induce this failure.
---
 src/conf/snapshot_conf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/conf/snapshot_conf.c b/src/conf/snapshot_conf.c
index 0c5b005..c3a8494 100644
--- a/src/conf/snapshot_conf.c
+++ b/src/conf/snapshot_conf.c
@@ -995,6 +995,9 @@ virDomainSnapshotDropParent(virDomainSnapshotObjPtr snapshot)
     virDomainSnapshotObjPtr prev = NULL;
     virDomainSnapshotObjPtr curr = NULL;

+    if (!snapshot || !snapshot->parent)
+        return;
+
     snapshot->parent->nchildren--;
     curr = snapshot->parent->first_child;
     while (curr != snapshot) {
-- 
1.8.1.1

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