Fuzz mosqutti_topic_tokenise

fuzzing/libcommon/Makefile

@@ -6,6 +6,7 @@ include ${R}/fuzzing/config.mk
 FUZZERS:= \
 	libcommon_fuzz_pub_topic_check2 \
 	libcommon_fuzz_sub_topic_check2 \
+	libcommon_fuzz_topic_tokenise \
 	libcommon_fuzz_utf8
 
 LOCAL_CPPFLAGS+=-I${R}/include/
@@ -23,6 +24,10 @@ libcommon_fuzz_sub_topic_check2 : libcommon_fuzz_sub_topic_check2.cpp
 	$(CXX) $(LOCAL_CXXFLAGS) $(LOCAL_CPPFLAGS) $(LOCAL_LDFLAGS) -o $@ $^ $(LOCAL_LIBADD)
 	install $@ ${OUT}/$@
 
+libcommon_fuzz_topic_tokenise : libcommon_fuzz_topic_tokenise.cpp
+	$(CXX) $(LOCAL_CXXFLAGS) $(LOCAL_CPPFLAGS) $(LOCAL_LDFLAGS) -o $@ $^ $(LOCAL_LIBADD)
+	install $@ ${OUT}/$@
+
 libcommon_fuzz_utf8 : libcommon_fuzz_utf8.cpp
 	$(CXX) $(LOCAL_CXXFLAGS) $(LOCAL_CPPFLAGS) $(LOCAL_LDFLAGS) -o $@ $^ $(LOCAL_LIBADD)
 	install $@ ${OUT}/$@

fuzzing/libcommon/libcommon_fuzz_topic_tokenise.cpp

@@ -0,0 +1,36 @@
+/*
+Copyright (c) 2023 Cedalo GmbH
+
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+and Eclipse Distribution License v1.0 which accompany this distribution.
+
+The Eclipse Public License is available at
+   https://www.eclipse.org/legal/epl-2.0/
+and the Eclipse Distribution License is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+
+Contributors:
+   Roger Light - initial implementation and documentation.
+*/
+#include <mosquitto.h>
+#include <cstdlib>
+#include <cstring>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	char *buf;
+	buf = (char *)calloc(1, size+1); /* ensure ull terminated */
+	if(buf){
+		char **topics = NULL;;
+		int count;
+
+		memcpy(buf, data, size);
+		mosquitto_sub_topic_tokenise(buf, &topics, &count);
+		mosquitto_sub_topic_tokens_free(&topics, count);
+		free(buf);
+	}
+	return 0;
+}