qemu-option: Fix qemu_opts_set_defaults() for corner cases

Commit 4f6dd9a changed the initialization of opts in opts_parse() to
this:

    if (defaults) {
        if (!id && !QTAILQ_EMPTY(&list->head)) {
            opts = qemu_opts_find(list, NULL);
        } else {
            opts = qemu_opts_create(list, id, 0);
        }
    } else {
        opts = qemu_opts_create(list, id, 1);
    }

Same as before for !defaults.

If defaults is true, and params has no ID, and options exist, we use
the first assignment.  It sets opts to null if all options have an ID.
opts_parse() then returns null.  qemu_opts_set_defaults() asserts the
value is non-null.  It's the only caller that passes true for
defaults.

To reproduce, try "-M xenpv -machine id=foo" (yes, "id=foo" is silly,
but it shouldn't crash).

I believe the function attempts to do the following:

    If options don't yet exist, create new options
    Else, if defaults, modify the existing options
    Else, if list->merge_lists, modify the existing options
    Else, fail

A straightforward call of qemu_opts_create() does exactly that.

Cc: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1372943363-24081-3-git-send-email-armbru@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --git a/util/qemu-option.c b/util/qemu-option.c
index 2715f27e410cd1af7f45a04574cdc9f1d4906c23..e0ef426daa009a95180b8ec0c743c53ecf77d3f9 100644 (file)
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -914,15 +914,7 @@ static QemuOpts *opts_parse(QemuOptsList *list, const char *params,
         get_opt_value(value, sizeof(value), p+4);
         id = value;
     }
-    if (defaults) {
-        if (!id && !QTAILQ_EMPTY(&list->head)) {
-            opts = qemu_opts_find(list, NULL);
-        } else {
-            opts = qemu_opts_create(list, id, 0, &local_err);
-        }
-    } else {
-        opts = qemu_opts_create(list, id, 1, &local_err);
-    }
+    opts = qemu_opts_create(list, id, !defaults, &local_err);
     if (opts == NULL) {
         if (error_is_set(&local_err)) {
             qerror_report_err(local_err);