[Qemu-devel] [PATCH 06/12] qga: process_event() simplification and leak fix

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

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.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 qga/main.c | 50 +++++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/qga/main.c b/qga/main.c
index 537cc0e162..0784761605 100644
--- a/qga/main.c
+++ b/qga/main.c
@@ -600,6 +600,7 @@ static void process_command(GAState *s, QDict *req)
 static void process_event(JSONMessageParser *parser, GQueue *tokens)
 {
     GAState *s = container_of(parser, GAState, parser);
+    QObject *obj;
     QDict *qdict;
     Error *err = NULL;
     int ret;
@@ -607,35 +608,34 @@ static void process_event(JSONMessageParser *parser, GQueue *tokens)
     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;
     }
-
-    /* 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));
-        }
+    qdict = qobject_to(QDict, obj);
+    if (!qdict) {
+        error_setg(&err, QERR_JSON_PARSING);
+        goto err;
+    }
+    if (!qdict_haskey(qdict, "execute")) {
+        g_warning("unrecognized payload format");
+        error_setg(&err, QERR_UNSUPPORTED);
+        goto err;
     }
 
+    process_command(s, qdict);
+    qobject_unref(obj);
+    return;
+
+err:
+    g_warning("failed to parse event: %s", error_get_pretty(err));
+    qdict = qmp_error_response(err);
+    ret = send_response(s, qdict);
+    if (ret < 0) {
+        g_warning("error sending error response: %s", strerror(-ret));
+    }
     qobject_unref(qdict);
+    qobject_unref(obj);
 }
 
 /* false return signals GAChannel to close the current client connection */
-- 
2.18.0.rc1