[PATCH 1/2] virStorageBackendRBDGetVolNames: Fix memory leak in 'rbd_list2' version

[Peter Krempa]

The 'rbd_image_spec_t' struct has two string members 'id' and
'name'. We only stole the 'name' members thus the 'id's as well as the
whole list would be leaked on success.

Restructure the code so that we copy out the image names and call
rbd_image_spec_list_cleanup on success rather than on error.

The error path is then handled by using g_autofree for 'images'.

Since we no longer have a error path after allocating the returned
string list we can completely remove it's cleanup.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/storage/storage_backend_rbd.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/src/storage/storage_backend_rbd.c b/src/storage/storage_backend_rbd.c
index ce3ab11dd6..371ebfaf1b 100644
--- a/src/storage/storage_backend_rbd.c
+++ b/src/storage/storage_backend_rbd.c
@@ -579,9 +579,8 @@ static char **
 virStorageBackendRBDGetVolNames(virStorageBackendRBDState *ptr)
 {
     char **names = NULL;
-    size_t nnames = 0;
     int rc;
-    rbd_image_spec_t *images = NULL;
+    g_autofree rbd_image_spec_t *images = NULL;
     size_t nimages = 16;
     size_t i;

@@ -593,23 +592,18 @@ virStorageBackendRBDGetVolNames(virStorageBackendRBDState *ptr)
             break;
         if (rc != -ERANGE) {
             virReportSystemError(errno, "%s", _("Unable to list RBD images"));
-            goto error;
+            return NULL;
         }
     }

     names = g_new0(char *, nimages + 1);
-    nnames = nimages;

     for (i = 0; i < nimages; i++)
-        names[i] = g_steal_pointer(&images[i].name);
+        names[i] = g_strdup(images[i].name);

-    return names;
-
- error:
-    virStringListFreeCount(names, nnames);
     rbd_image_spec_list_cleanup(images, nimages);
-    VIR_FREE(images);
-    return NULL;
+
+    return names;
 }

 #else /* ! WITH_RBD_LIST2 */
-- 
2.31.1