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qga: process_event() simplification and leak fix 

json_parser_parse_err() may return something else than a QDict, in
which case we loose the object. Let's keep track of the original
object to avoid leaks.

When an error occurs, "qdict" contains the response, but we still
check the "execute" key there. Untangle a bit this code, by having a
clear error path.

CC: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Marc-André Lureau 2018-07-19 20:40:59 +02:00 committed by Michael Roth
parent c5840b905e
commit ae7da1e5f6
1 changed files with 27 additions and 27 deletions
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54
qga/main.c
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@ -600,42 +600,42 @@ static void process_command(GAState *s, QDict *req)
static void process_event(JSONMessageParser *parser, GQueue *tokens)
{
GAState *s = container_of(parser, GAState, parser);
QDict *qdict;
QObject *obj;
QDict *req, *rsp;
Error *err = NULL;
int ret;
g_assert(s && parser);
g_debug("process_event: called");
qdict = qobject_to(QDict, json_parser_parse_err(tokens, NULL, &err));
if (err || !qdict) {
qobject_unref(qdict);
if (!err) {
g_warning("failed to parse event: unknown error");
error_setg(&err, QERR_JSON_PARSING);
} else {
g_warning("failed to parse event: %s", error_get_pretty(err));
}
qdict = qmp_error_response(err);
obj = json_parser_parse_err(tokens, NULL, &err);
if (err) {
goto err;
}
req = qobject_to(QDict, obj);
if (!req) {
error_setg(&err, QERR_JSON_PARSING);
goto err;
}
if (!qdict_haskey(req, "execute")) {
g_warning("unrecognized payload format");
error_setg(&err, QERR_UNSUPPORTED);
goto err;
}
/* handle host->guest commands */
if (qdict_haskey(qdict, "execute")) {
process_command(s, qdict);
} else {
if (!qdict_haskey(qdict, "error")) {
qobject_unref(qdict);
g_warning("unrecognized payload format");
error_setg(&err, QERR_UNSUPPORTED);
qdict = qmp_error_response(err);
}
ret = send_response(s, qdict);
if (ret < 0) {
g_warning("error sending error response: %s", strerror(-ret));
}
}
process_command(s, req);
qobject_unref(obj);
return;
qobject_unref(qdict);
err:
g_warning("failed to parse event: %s", error_get_pretty(err));
rsp = qmp_error_response(err);
ret = send_response(s, rsp);
if (ret < 0) {
g_warning("error sending error response: %s", strerror(-ret));
}
qobject_unref(rsp);
qobject_unref(obj);
}
/* false return signals GAChannel to close the current client connection */