From: Stephan Bosch <stephan.bosch@open-xchange.com>
Date: Fri, 16 Oct 2020 11:35:18 +0000 (+0200)
Subject: lib-json: Add fuzz target for parsing JSON tree from istream
X-Git-Tag: 2.4.0~2359
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0e4ff99db47cf663303018e0439f7c02dfa1f69;p=thirdparty%2Fdovecot%2Fcore.git

lib-json: Add fuzz target for parsing JSON tree from istream
---

diff --git a/src/lib-json/Makefile.am b/src/lib-json/Makefile.am
index 2dac5aa022..661a88e74f 100644
--- a/src/lib-json/Makefile.am
+++ b/src/lib-json/Makefile.am
@@ -36,7 +36,14 @@ test_programs = \
 	test-json-tree \
 	test-json-tree-io
 
-noinst_PROGRAMS = json-format $(test_programs)
+fuzz_programs =
+
+if USE_FUZZER
+fuzz_programs += \
+        fuzz-json-istream
+endif
+
+noinst_PROGRAMS = json-format $(test_programs) $(fuzz_programs)
 
 json_format_SOURCE = \
 	json-format.c
@@ -110,6 +117,18 @@ test_json_tree_io_DEPENDENCIES = \
 pkginc_libdir=$(pkgincludedir)
 pkginc_lib_HEADERS = $(headers)
 
+nodist_EXTRA_fuzz_json_istream_SOURCES = force-cxx-linking.cxx
+fuzz_json_istream_CPPFLAGS = \
+	$(FUZZER_CPPFLAGS)
+fuzz_json_istream_LDFLAGS = \
+	$(FUZZER_LDFLAGS)
+fuzz_json_istream_SOURCES = \
+	fuzz-json-istream.c
+fuzz_json_istream_LDADD = \
+	$(test_libs)
+fuzz_json_istream_DEPENDENCIES = \
+	$(test_deps)
+
 check: check-am check-test
 check-test: all-am
 	for bin in $(test_programs); do \
diff --git a/src/lib-json/fuzz-json-istream.c b/src/lib-json/fuzz-json-istream.c
new file mode 100644
index 0000000000..a9ec202350
--- /dev/null
+++ b/src/lib-json/fuzz-json-istream.c
@@ -0,0 +1,36 @@
+/* Copyright (c) 2023 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "istream.h"
+#include "test-common.h"
+#include "test-common.h"
+#include "fuzzer.h"
+
+#include "json-types.h"
+#include "json-parser.h"
+#include "json-istream.h"
+
+FUZZ_BEGIN_DATA(const unsigned char *data, size_t size)
+{
+	struct istream *input;
+	struct json_limits limits = {
+		.max_name_size = 1024U,
+		.max_string_size = 1024U,
+		.max_nesting = 10U,
+		.max_list_items = JSON_DEFAULT_MAX_LIST_ITEMS,
+	};
+	struct json_tree *tree = NULL;
+	struct json_istream *jinput;
+	int ret;
+
+	input = test_istream_create_data(data, size);
+	jinput = json_istream_create(input, JSON_ISTREAM_TYPE_NORMAL, &limits,
+				     JSON_PARSER_FLAG_STRICT);
+	ret = json_istream_read_tree(jinput, &tree);
+	i_assert(ret < 1 || tree != NULL);
+	if (tree != NULL)
+		json_tree_unref(&tree);
+	json_istream_unref(&jinput);
+	i_stream_unref(&input);
+}
+FUZZ_END