[libvirt] [PATCH] conf: Don't corrupt metadata on OOM

[Peter Krempa]

Eric Blake suggested that we could do a little better in case copying of
the metadata to be set fails. With this patch, the old metadata is
discarded after the new string is copied successfuly.
---
 src/conf/domain_conf.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 7e78068..60f25ab 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -18599,19 +18599,24 @@ virDomainDefSetMetadata(virDomainDefPtr def,
     xmlDocPtr doc = NULL;
     xmlNodePtr old;
     xmlNodePtr new;
+    char *tmp;
     int ret = -1;

     switch ((virDomainMetadataType) type) {
     case VIR_DOMAIN_METADATA_DESCRIPTION:
-        VIR_FREE(def->description);
-        if (VIR_STRDUP(def->description, metadata) < 0)
+        if (VIR_STRDUP(tmp, metadata) < 0)
             goto cleanup;
+
+        VIR_FREE(def->description);
+        def->description = tmp;
         break;

     case VIR_DOMAIN_METADATA_TITLE:
-        VIR_FREE(def->title);
-        if (VIR_STRDUP(def->title, metadata) < 0)
+        if (VIR_STRDUP(tmp, metadata) < 0)
             goto cleanup;
+
+        VIR_FREE(def->title);
+        def->title = tmp;
         break;

     case VIR_DOMAIN_METADATA_ELEMENT:
-- 
1.8.3.2