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qdev-monitor: fix segmentation fault on qdev_device_help() 

Normally, qmp_device_list_properties() may return NULL when
a device haven't special properties excpet Object and DeviceState
properties, such as virtio-balloon-device.

We just need check local_err instead of prop_list.

Example:

Segmentation fault (core dumped)

The backtrace as below:

Program received signal SIGSEGV, Segmentation fault.
0x00005555559af1a8 in error_get_pretty (err=0x0) at util/error.c:152
152         return err->msg;
(gdb) bt
    func=0x55555574a6ca <device_help_func>, opaque=0x0, abort_on_failure=0) at util/qemu-option.c:1072

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Gonglei 2014-09-16 10:19:33 +08:00 committed by Stefan Hajnoczi
parent 8007429a99
commit 0722eba945
1 changed files with 1 additions and 1 deletions
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2
qdev-monitor.c
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@ -206,7 +206,7 @@ int qdev_device_help(QemuOpts *opts)
}
prop_list = qmp_device_list_properties(driver, &local_err);
if (!prop_list) {
if (local_err) {
error_printf("%s\n", error_get_pretty(local_err));
error_free(local_err);
return 1;