nbd: Utilize QAPI_CLONE for type conversion

Rather than open-coding the translation from the deprecated NbdServerAddOptions type to the preferred BlockExportOptionsNbd, it's better to utilize QAPI_CLONE_MEMBERS. This solves a couple of issues: first, if we do any more refactoring of the base type (which an upcoming patch plans to do), we don't have to revisit the open-coding. Second, our assignment to arg->name is fishy: the generated QAPI code for qapi_free_NbdServerAddOptions does not visit arg->name if arg->has_name is false, but if it DID visit it, we would have introduced a double-free situation when arg is finally freed. Signed-off-by: Eric Blake <[email protected]> Reviewed-by: Vladimir Sementsov-Ogievskiy <[email protected]> Reviewed-by: Markus Armbruster <[email protected]> Message-Id: <[email protected]>
Spiderdraco · Oct 30, 2020 · 8675cbd · 8675cbd
1 parent 9812e71
commit 8675cbd
Showing 1 changed file with 6 additions and 9 deletions.
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
@@ -14,6 +14,8 @@
 #include "sysemu/block-backend.h"
 #include "hw/block/block.h"
 #include "qapi/error.h"
+#include "qapi/clone-visitor.h"
+#include "qapi/qapi-visit-block-export.h"
 #include "qapi/qapi-commands-block-export.h"
 #include "block/nbd.h"
 #include "io/channel-socket.h"
@@ -195,7 +197,8 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp)
      * the device name as a default here for compatibility.
      */
     if (!arg->has_name) {
-        arg->name = arg->device;
+        arg->has_name = true;
+        arg->name = g_strdup(arg->device);
     }
 
     export_opts = g_new(BlockExportOptions, 1);
@@ -205,15 +208,9 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp)
         .node_name              = g_strdup(bdrv_get_node_name(bs)),
         .has_writable           = arg->has_writable,
         .writable               = arg->writable,
-        .u.nbd = {
-            .has_name           = true,
-            .name               = g_strdup(arg->name),
-            .has_description    = arg->has_description,
-            .description        = g_strdup(arg->description),
-            .has_bitmap         = arg->has_bitmap,
-            .bitmap             = g_strdup(arg->bitmap),
-        },
     };
+    QAPI_CLONE_MEMBERS(BlockExportOptionsNbd, &export_opts->u.nbd,
+                       qapi_NbdServerAddOptions_base(arg));
 
     /*
      * nbd-server-add doesn't complain when a read-only device should be