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From 38d4fe12ad2e3bc18842201f437c480120eace2b Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Wed, 27 Jul 2016 07:35:02 +0200
Subject: [PATCH 04/16] check-qjson: Add test for JSON nesting depth limit

RH-Author: Markus Armbruster <armbru@redhat.com>
Message-id: <1469604913-12442-6-git-send-email-armbru@redhat.com>
Patchwork-id: 71481
O-Subject: [RHEL-7.3 qemu-kvm PATCH v2 04/15] check-qjson: Add test for JSON nesting depth limit
Bugzilla: 1276036
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

This would have prevented the regression mentioned in the previous
commit.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <1448486613-17634-4-git-send-email-armbru@redhat.com>
(cherry picked from commit f0ae0304c7a41a42b7d4a6cde450da938d3c2cc7)
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 tests/check-qjson.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tests/check-qjson.c b/tests/check-qjson.c
index 4e74548..c5dd74d 100644
--- a/tests/check-qjson.c
+++ b/tests/check-qjson.c
@@ -1465,6 +1465,30 @@ static void unterminated_literal(void)
     g_assert(obj == NULL);
 }
 
+static char *make_nest(char *buf, size_t cnt)
+{
+    memset(buf, '[', cnt - 1);
+    buf[cnt - 1] = '{';
+    buf[cnt] = '}';
+    memset(buf + cnt + 1, ']', cnt - 1);
+    buf[2 * cnt] = 0;
+    return buf;
+}
+
+static void limits_nesting(void)
+{
+    enum { max_nesting = 1024 }; /* see qobject/json-streamer.c */
+    char buf[2 * (max_nesting + 1) + 1];
+    QObject *obj;
+
+    obj = qobject_from_json(make_nest(buf, max_nesting));
+    g_assert(obj != NULL);
+    qobject_decref(obj);
+
+    obj = qobject_from_json(make_nest(buf, max_nesting + 1));
+    g_assert(obj == NULL);
+}
+
 int main(int argc, char **argv)
 {
     g_test_init(&argc, &argv, NULL);
@@ -1500,6 +1524,7 @@ int main(int argc, char **argv)
     g_test_add_func("/errors/invalid_array_comma", invalid_array_comma);
     g_test_add_func("/errors/invalid_dict_comma", invalid_dict_comma);
     g_test_add_func("/errors/unterminated/literal", unterminated_literal);
+    g_test_add_func("/errors/limits/nesting", limits_nesting);
 
     return g_test_run();
 }
-- 
1.8.3.1