[Qemu-devel] [RFC v2 1/7] qemu-option: qemu_opt_set_bool(): fix code duplication

[Dong Xu Wang <wdongxu@linux.vnet.ibm.com>]

Call qemu_opt_set() instead of duplicating opt_set().

It will set opt->str in qemu_opt_set_bool, without opt->str, there
will be some potential bugs.

These are uses of opt->str, and what happens when it isn't set:

* qemu_opt_get(): returns NULL, which means "not set".  Bug can bite
  when value isn't the default value.

* qemu_opt_parse(): passes NULL to parse_option_bool(), which treats it
  like "on".  Wrong if the value is actually false.  Bug can bite when
  qemu_opts_validate() runs after qemu_opt_set_bool().

* qemu_opt_del(): passes NULL to g_free(), which is just fine.

* qemu_opt_foreach(): passes NULL to the callback, which is unlikely to
  be prepared for it.

* qemu_opts_print(): prints NULL, which crashes on some systems.

* qemu_opts_to_qdict(): passes NULL to qstring_from_str(), which
  crashes.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Dong Xu Wang <wdongxu@linux.vnet.ibm.com>
---
 qemu-option.c |   28 +---------------------------
 1 files changed, 1 insertions(+), 27 deletions(-)

diff --git a/qemu-option.c b/qemu-option.c
index 27891e7..0b81e77 100644
--- a/qemu-option.c
+++ b/qemu-option.c
@@ -667,33 +667,7 @@ void qemu_opt_set_err(QemuOpts *opts, const char *name, const char *value,
 
 int qemu_opt_set_bool(QemuOpts *opts, const char *name, bool val)
 {
-    QemuOpt *opt;
-    const QemuOptDesc *desc = opts->list->desc;
-    int i;
-
-    for (i = 0; desc[i].name != NULL; i++) {
-        if (strcmp(desc[i].name, name) == 0) {
-            break;
-        }
-    }
-    if (desc[i].name == NULL) {
-        if (i == 0) {
-            /* empty list -> allow any */;
-        } else {
-            qerror_report(QERR_INVALID_PARAMETER, name);
-            return -1;
-        }
-    }
-
-    opt = g_malloc0(sizeof(*opt));
-    opt->name = g_strdup(name);
-    opt->opts = opts;
-    QTAILQ_INSERT_TAIL(&opts->head, opt, next);
-    if (desc[i].name != NULL) {
-        opt->desc = desc+i;
-    }
-    opt->value.boolean = !!val;
-    return 0;
+    return qemu_opt_set(opts, name, val ? "on" : "off");
 }
 
 int qemu_opt_foreach(QemuOpts *opts, qemu_opt_loopfunc func, void *opaque,
-- 
1.7.1