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qmp: Don't let JSON errors jump the queue

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handle_qmp_command() reports JSON syntax errors right away.  This is
wrong when OOB is enabled, because the errors can "jump the queue"
then.

The previous commit fixed the same bug for semantic errors, by
delaying the checking until dispatch.  We can't delay the checking, so
delay the reporting.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180703085358.13941-19-armbru@redhat.com>
This commit is contained in:
Markus Armbruster 2018-07-03 10:53:44 +02:00
parent 69240fe62d
commit 1cc3747152
1 changed files with 15 additions and 8 deletions
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23
monitor.c
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@ -254,8 +254,12 @@ struct QMPRequest {
Monitor *mon;
/* "id" field of the request */
QObject *id;
/* Request object to be handled */
/*
* Request object to be handled or Error to be reported
* (exactly one of them is non-null)
*/
QObject *req;
Error *err;
/*
* Whether we need to resume the monitor afterward. This flag is
* used to emulate the old QMP server behavior that the current
@ -360,6 +364,7 @@ static void qmp_request_free(QMPRequest *req)
{
qobject_unref(req->id);
qobject_unref(req->req);
error_free(req->err);
g_free(req);
}
@ -4199,8 +4204,14 @@ static void monitor_qmp_bh_dispatcher(void *data)
return;
}
trace_monitor_qmp_cmd_in_band(qobject_get_try_str(req_obj->id) ?: "");
monitor_qmp_dispatch(req_obj->mon, req_obj->req, req_obj->id);
if (req_obj->req) {
trace_monitor_qmp_cmd_in_band(qobject_get_try_str(req_obj->id) ?: "");
monitor_qmp_dispatch(req_obj->mon, req_obj->req, req_obj->id);
} else {
assert(req_obj->err);
monitor_qmp_respond(req_obj->mon, NULL, req_obj->err, NULL);
}
if (req_obj->need_resume) {
/* Pairs with the monitor_suspend() in handle_qmp_command() */
monitor_resume(req_obj->mon);
@ -4227,11 +4238,6 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens)
/* json_parser_parse_err() sucks: can fail without setting @err */
error_setg(&err, QERR_JSON_PARSING);
}
if (err) {
assert(!req);
monitor_qmp_respond(mon, NULL, err, NULL);
return;
}
qdict = qobject_to(QDict, req);
if (qdict) {
@ -4257,6 +4263,7 @@ static void handle_qmp_command(JSONMessageParser *parser, GQueue *tokens)
req_obj->mon = mon;
req_obj->id = id;
req_obj->req = req;
req_obj->err = err;
req_obj->need_resume = false;
/* Protect qmp_requests and fetching its length. */