Problem: no fuzz testing for options

Solution: add it

Makefile.am

@@ -1122,7 +1122,8 @@ if FUZZING_ENGINE_LIB
 fuzzer_apps = tests/test_bind_null_fuzzer \
 	tests/test_connect_null_fuzzer \
 	tests/test_bind_fuzzer \
-	tests/test_connect_fuzzer
+	tests/test_connect_fuzzer \
+	tests/test_socket_options_fuzzer
 
 tests_test_bind_null_fuzzer_DEPENDENCIES = src/libzmq.la
 tests_test_bind_null_fuzzer_SOURCES = tests/test_bind_null_fuzzer.cpp
@@ -1156,6 +1157,14 @@ tests_test_connect_fuzzer_LDADD = ${TESTUTIL_LIBS} ${FUZZING_ENGINE_LIB} \
 tests_test_connect_fuzzer_CPPFLAGS = ${TESTUTIL_CPPFLAGS}
 tests_test_connect_fuzzer_CXXFLAGS = -std=c++11
 
+tests_test_socket_options_fuzzer_DEPENDENCIES = src/libzmq.la
+tests_test_socket_options_fuzzer_SOURCES = tests/test_socket_options_fuzzer.cpp
+tests_test_socket_options_fuzzer_LDADD = ${TESTUTIL_LIBS} ${FUZZING_ENGINE_LIB} \
+		$(top_builddir)/src/.libs/libzmq.a \
+		${src_libzmq_la_LIBADD}
+tests_test_socket_options_fuzzer_CPPFLAGS = ${TESTUTIL_CPPFLAGS}
+tests_test_socket_options_fuzzer_CXXFLAGS = -std=c++11
+
 if HAVE_CURVE
 fuzzer_apps += tests/test_bind_curve_fuzzer \
 	tests/test_connect_curve_fuzzer \
@@ -1213,7 +1222,8 @@ else
 test_apps += tests/test_bind_null_fuzzer \
 	tests/test_connect_null_fuzzer \
 	tests/test_bind_fuzzer \
-	tests/test_connect_fuzzer
+	tests/test_connect_fuzzer \
+	tests/test_socket_options_fuzzer
 
 tests_test_bind_null_fuzzer_SOURCES = tests/test_bind_null_fuzzer.cpp
 tests_test_bind_null_fuzzer_LDADD = ${TESTUTIL_LIBS} src/libzmq.la
@@ -1231,6 +1241,10 @@ tests_test_connect_fuzzer_SOURCES = tests/test_connect_fuzzer.cpp
 tests_test_connect_fuzzer_LDADD = ${TESTUTIL_LIBS} src/libzmq.la
 tests_test_connect_fuzzer_CPPFLAGS = ${TESTUTIL_CPPFLAGS}
 
+tests_test_socket_options_fuzzer_SOURCES = tests/test_socket_options_fuzzer.cpp
+tests_test_socket_options_fuzzer_LDADD = ${TESTUTIL_LIBS} src/libzmq.la
+tests_test_socket_options_fuzzer_CPPFLAGS = ${TESTUTIL_CPPFLAGS}
+
 if HAVE_CURVE
 test_apps += tests/test_bind_curve_fuzzer \
 	tests/test_connect_curve_fuzzer \

tests/test_socket_options_fuzzer.cpp

@@ -0,0 +1,90 @@
+/*
+    Copyright (c) 2020 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef ZMQ_USE_FUZZING_ENGINE
+#include <fuzzer/FuzzedDataProvider.h>
+#endif
+
+#include <string>
+#include <stdlib.h>
+
+#include "testutil.hpp"
+#include "testutil_unity.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput (const uint8_t *data, size_t size)
+{
+    setup_test_context ();
+    void *s = test_context_socket (ZMQ_XPUB);
+    int option;
+
+    for (option = ZMQ_AFFINITY; option < ZMQ_BINDTODEVICE + 1; ++option) {
+        uint8_t out[512];
+        size_t out_size = 512;
+
+        zmq_setsockopt(s, option, data, size);
+        zmq_getsockopt(s, option, out, &out_size);
+    }
+
+    test_context_socket_close_zero_linger (s);
+    teardown_test_context ();
+
+    return 0;
+}
+
+#ifndef ZMQ_USE_FUZZING_ENGINE
+void test_socket_options_fuzzer ()
+{
+    uint8_t **data;
+    size_t *len, num_cases = 0;
+    if (fuzzer_corpus_encode (
+          "tests/libzmq-fuzz-corpora/test_socket_options_fuzzer_seed_corpus", &data,
+          &len, &num_cases)
+        != 0)
+        exit (77);
+
+    while (num_cases-- > 0) {
+        TEST_ASSERT_SUCCESS_ERRNO (
+          LLVMFuzzerTestOneInput (data[num_cases], len[num_cases]));
+        free (data[num_cases]);
+    }
+
+    free (data);
+    free (len);
+}
+
+int main (int argc, char **argv)
+{
+    setup_test_environment ();
+
+    UNITY_BEGIN ();
+    RUN_TEST (test_socket_options_fuzzer);
+
+    return UNITY_END ();
+}
+#endif