xen-block: stop leaking memory in xen_block_drive_create()

The locally allocated QDict-s need to be freed. ('file_layer' will be
freed implicitly since it is added as an object to 'driver_layer').

Spotted by Coverity: CID 1398649

While in the neighbourhood free 'driver' and 'filename' as soon as they are
added to the QDicts. Freeing after the 'done' label doesn't make that much
sense as, if the error path jumps to that label, the values would be NULL
anyway.

This patch also makes that more obvious by taking the error path if
'params' is NULL and then asserting that both driver and filename are
non-NULL in the normal path.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Message-Id: <20190219163440.15702-1-paul.durrant@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c
index 37a456c20707712b064d74c46a0711e235cd0edd..70fc2455e8a1a4b244441b317718f38ec2450cc4 100644 (file)
--- a/hw/block/xen-block.c
+++ b/hw/block/xen-block.c
@@ -743,12 +743,12 @@ static XenBlockDrive *xen_block_drive_create(const char *id,
         }
 
         g_strfreev(v);
-    }
-
-    if (!filename) {
-        error_setg(errp, "no filename");
+    } else {
+        error_setg(errp, "no params");
         goto done;
     }
+
+    assert(filename);
     assert(driver);
 
     drive = g_new0(XenBlockDrive, 1);
@@ -758,6 +758,7 @@ static XenBlockDrive *xen_block_drive_create(const char *id,
 
     qdict_put_str(file_layer, "driver", "file");
     qdict_put_str(file_layer, "filename", filename);
+    g_free(filename);
 
     if (mode && *mode != 'w') {
         qdict_put_bool(file_layer, "read-only", true);
@@ -793,16 +794,17 @@ static XenBlockDrive *xen_block_drive_create(const char *id,
     driver_layer = qdict_new();
 
     qdict_put_str(driver_layer, "driver", driver);
+    g_free(driver);
+
     qdict_put_obj(driver_layer, "file", QOBJECT(file_layer));
 
     g_assert(!drive->node_name);
     drive->node_name = xen_block_blockdev_add(drive->id, driver_layer,
                                               &local_err);
 
-done:
-    g_free(driver);
-    g_free(filename);
+    qobject_unref(driver_layer);
 
+done:
     if (local_err) {
         error_propagate(errp, local_err);
         xen_block_drive_destroy(drive, NULL);