fuzz_tests: add a tx extra fuzz test

tests/fuzz/CMakeLists.txt

@@ -200,3 +200,21 @@ set_property(TARGET bulletproof_fuzz_tests
   PROPERTY
     FOLDER "tests")
 
+add_executable(tx-extra_fuzz_tests tx-extra.cpp fuzzer.cpp)
+target_link_libraries(tx-extra_fuzz_tests
+  PRIVATE
+    cryptonote_basic
+    common
+    epee
+    ${Boost_THREAD_LIBRARY}
+    ${Boost_CHRONO_LIBRARY}
+    ${Boost_REGEX_LIBRARY}
+    ${Boost_PROGRAM_OPTIONS_LIBRARY}
+    ${Boost_SYSTEM_LIBRARY}
+    ${CMAKE_THREAD_LIBS_INIT}
+    ${EXTRA_LIBRARIES}
+    $ENV{LIB_FUZZING_ENGINE})
+set_property(TARGET tx-extra_fuzz_tests
+  PROPERTY
+    FOLDER "tests")
+

tests/fuzz/tx-extra.cpp

@@ -0,0 +1,40 @@
+// Copyright (c) 2020, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "include_base_utils.h"
+#include "cryptonote_basic/cryptonote_format_utils.h"
+#include "fuzzer.h"
+
+BEGIN_INIT_SIMPLE_FUZZER()
+END_INIT_SIMPLE_FUZZER()
+
+BEGIN_SIMPLE_FUZZER()
+  std::vector<cryptonote::tx_extra_field> tx_extra_fields;
+  cryptonote::parse_tx_extra(std::vector<uint8_t>(buf, buf + len), tx_extra_fields);
+END_SIMPLE_FUZZER()
+