Merge #17050: tests: Add fuzzing harnesses for functions parsing scripts, numbers, JSON and HD keypaths (bip32)

a1308b7e12e6af7482954e439f594b771eb62b73 tests: Add fuzzing harnesses for various JSON/univalue parsing functions (practicalswift)
e3d2bcf5cf7a53e5ca671cfed1fe7b6cf0c191ba tests: Add fuzzing harnesses for various number parsing functions (practicalswift)
fb8c12093aa37f5536a1a4ba341ee8bab4dabe60 tests: Add ParseScript(...) (core_io) fuzzing harness (practicalswift)
074cb6451b16158589d743488930963bcf4b024c tests: Add ParseHDKeypath(...) (bip32) fuzzing harness (practicalswift)
0dc5907d0f0490036c50cb7aee19e31075bbf402 tests: Add corpora suppression (FUZZERS_MISSING_CORPORA) for fuzzers missing in https://github.com/bitcoin-core/qa-assets/tree/master/fuzz_seed_corpus (practicalswift)

Pull request description:

  Add fuzzing harnesses for `DecodeRawPSBT(...)`, `ParseHDKeypath(...)`, `ParseScript(...)`, various number parsing functions and various JSON/univalue parsing functions.

  **Testing this PR**
  As usual the best way to test proposed fuzzing harnesses is to use `test_fuzzing_harnesses.sh` (#17000) to quickly verify that the relevant code regions are triggered, that the fuzzing throughput seems reasonable, etc.

  `test_fuzzing_harnesses.sh 'psbt|hd_keypath|numbers|parse_script|univalue' 10` runs all fuzzers matching the regexp and gives them ten seconds of runtime each.

  ```
  $ CC=clang CXX=clang++ ./configure --enable-fuzz --with-sanitizers=address,fuzzer,undefined
  $ make
  $ contrib/devtools/test_fuzzing_harnesses.sh 'psbt|hd_keypath|numbers|parse_script|univalue' 10
  Testing fuzzer parse_hd_keypath during 10 second(s)
  A subset of reached functions:
          NEW_FUNC[0/2]: 0x55bc23a76940 in ParsePrechecks(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/util/strencodings.cpp:267
          NEW_FUNC[1/2]: 0x55bc23a77300 in ParseUInt32(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned int*) src/util/strencodings.cpp:309
  stat::number_of_executed_units: 34237
  stat::average_exec_per_sec:     3112
  stat::new_units_added:          113
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              282
  Number of unique code paths taken during fuzzing round: 30

  Testing fuzzer parse_numbers during 10 second(s)
  A subset of reached functions:
  stat::number_of_executed_units: 31309
  stat::average_exec_per_sec:     2846
  stat::new_units_added:          688
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              234
  Number of unique code paths taken during fuzzing round: 149

  Testing fuzzer parse_script during 10 second(s)
  A subset of reached functions:
          NEW_FUNC[1/11]: 0x5636ff61ba00 in IsDigit(char) src/./util/strencodings.h:70
          NEW_FUNC[0/14]: 0x5636fe6c6280 in CScript::operator<<(opcodetype) src/./script/script.h:448
          NEW_FUNC[1/14]: 0x5636fe6e0290 in prevector<28u, unsigned char, unsigned int, int>::insert(prevector<28u, unsigned char, unsigned int, int>::iterator, unsigned char const&) src/./prevector.h:342
          NEW_FUNC[2/14]: 0x5636fe6e1040 in prevector<28u, unsigned char, unsigned int, int>::size() const src/./prevector.h:277
          NEW_FUNC[3/14]: 0x5636fe6e1250 in prevector<28u, unsigned char, unsigned int, int>::capacity() const src/./prevector.h:295
          NEW_FUNC[4/14]: 0x5636fe6e1cb0 in prevector<28u, unsigned char, unsigned int, int>::item_ptr(int) src/./prevector.h:196
          NEW_FUNC[0/10]: 0x5636fe6c5650 in CScript::operator<<(std::vector<unsigned char, std::allocator<unsigned char> > const&) src/./script/script.h:462
          NEW_FUNC[2/10]: 0x5636fe6e0a20 in void prevector<28u, unsigned char, unsigned int, int>::insert<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > >(prevector<28u, unsigned char, unsigned int, int>::iterator, __gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<[32/1902]
  char> > >, __gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > >) src/./prevector.h:368
          NEW_FUNC[5/10]: 0x5636fe6e2350 in void prevector<28u, unsigned char, unsigned int, int>::fill<__gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > > >(unsigned char*, __gnu_cxx::__normal_iterator<unsigned char const*, std::vector<unsigned char, std::allocator<unsigned char> > >, __gnu_cxx::__normal_iterator<unsign
  ed char const*, std::vector<unsigned char, std::allocator<unsigned char> > >) src/./prevector.h:204
          NEW_FUNC[0/1]: 0x5636ff8e48b0 in IsHex(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/util/strencodings.cpp:61
          NEW_FUNC[0/2]: 0x5636fe6e1410 in prevector<28u, unsigned char, unsigned int, int>::change_capacity(unsigned int) src/./prevector.h:165
          NEW_FUNC[1/2]: 0x5636fe6e1f00 in prevector<28u, unsigned char, unsigned int, int>::indirect_ptr(int) src/./prevector.h:161
          NEW_FUNC[0/1]: 0x5636fe6e0580 in void prevector<28u, unsigned char, unsigned int, int>::insert<unsigned char*>(prevector<28u, unsigned char, unsigned int, int>::iterator, unsigned char*, unsigned char*) src/./prevector.h:368
          NEW_FUNC[0/3]: 0x5636fe85f0d0 in CScript::push_int64(long) src/./script/script.h:394
          NEW_FUNC[1/3]: 0x5636fe85f520 in prevector<28u, unsigned char, unsigned int, int>::push_back(unsigned char const&) src/./prevector.h:422
          NEW_FUNC[2/3]: 0x5636ff8ed730 in atoi64(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) src/util/strencodings.cpp:417
  stat::number_of_executed_units: 8153
  stat::average_exec_per_sec:     741
  stat::new_units_added:          296
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              237
  Number of unique code paths taken during fuzzing round: 98

  Testing fuzzer parse_univalue during 10 second(s)
  A subset of reached functions:
          NEW_FUNC[0/19]: 0x560db8655950 in tinyformat::detail::formatImpl(std::ostream&, char const*, tinyformat::detail::FormatArg const*, int) src/./tinyformat.h:791
          NEW_FUNC[4/19]: 0x560db86582b0 in tinyformat::detail::printFormatStringLiteral(std::ostream&, char const*) src/./tinyformat.h:564
          NEW_FUNC[5/19]: 0x560db8658690 in tinyformat::detail::streamStateFromFormat(std::ostream&, bool&, int&, char const*, tinyformat::detail::FormatArg const*, int&, int) src/./tinyformat.h:601
          NEW_FUNC[6/19]: 0x560db865f090 in tinyformat::detail::FormatArg::format(std::ostream&, char const*, char const*, int) const src/./tinyformat.h:513
          NEW_FUNC[12/19]: 0x560db8661ba0 in void tinyformat::detail::FormatArg::formatImpl<int>(std::ostream&, char const*, char const*, int, void const*) src/./tinyformat.h:530
          NEW_FUNC[13/19]: 0x560db8661d90 in void tinyformat::formatValue<int>(std::ostream&, char const*, char const*, int, int const&) src/./tinyformat.h:317
          NEW_FUNC[14/19]: 0x560db875c8b0 in void tinyformat::detail::FormatArg::formatImpl<unsigned int>(std::ostream&, char const*, char const*, int, void const*) src/./tinyformat.h:530
          NEW_FUNC[15/19]: 0x560db875caa0 in void tinyformat::formatValue<unsigned int>(std::ostream&, char const*, char const*, int, unsigned int const&) src/./tinyformat.h:317
          NEW_FUNC[16/19]: 0x560db9473ef0 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > tinyformat::format<int, unsigned int>(char const*, int const&, unsigned int const&) src/./tinyformat.h:976
          NEW_FUNC[17/19]: 0x560db94749a0 in void tinyformat::format<int, unsigned int>(std::ostream&, char const*, int const&, unsigned int const&) src/./tinyformat.h:968
          NEW_FUNC[18/19]: 0x560db9474cf0 in tinyformat::detail::FormatListN<2>::FormatListN<int, unsigned int>(int const&, unsigned int const&) src/./tinyformat.h:885
  stat::number_of_executed_units: 14089
  stat::average_exec_per_sec:     1280
  stat::new_units_added:          135
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              356
  Number of unique code paths taken during fuzzing round: 62

  Testing fuzzer psbt_input_deserialize during 10 second(s)
  A subset of reached functions:
          NEW_FUNC[0/46]: 0x557847ce3530 in prevector<28u, unsigned char, unsigned int, int>::~prevector() src/./prevector.h:456
          NEW_FUNC[3/46]: 0x557847cfdcf0 in prevector<28u, unsigned char, unsigned int, int>::size() const src/./prevector.h:277
          NEW_FUNC[4/46]: 0x557847cfe0c0 in prevector<28u, unsigned char, unsigned int, int>::change_capacity(unsigned int) src/./prevector.h:165
          NEW_FUNC[13/46]: 0x557847d3c890 in unsigned long ReadCompactSize<CDataStream>(CDataStream&) src/./serialize.h:290
          NEW_FUNC[14/46]: 0x557847d47b60 in prevector<28u, unsigned char, unsigned int, int>::resize(unsigned int) src/./prevector.h:311
          NEW_FUNC[16/46]: 0x557847d48800 in CTxOut::CTxOut() src/./primitives/transaction.h:140
          NEW_FUNC[17/46]: 0x557847d4b050 in CTxOut::SetNull() src/./primitives/transaction.h:155
          NEW_FUNC[18/46]: 0x557847d4b140 in CScript::clear() src/./script/script.h:563
          NEW_FUNC[19/46]: 0x557847d4ead0 in void Unserialize_impl<CDataStream, unsigned char, std::allocator<unsigned char> >(CDataStream&, std::vector<unsigned char, std::allocator<unsigned char> >&, unsigned char const&) src/./serialize.h:746
          NEW_FUNC[0/58]: 0x557847cfdf00 in prevector<28u, unsigned char, unsigned int, int>::capacity() const src/./prevector.h:295
          NEW_FUNC[1/58]: 0x557847cfe960 in prevector<28u, unsigned char, unsigned int, int>::item_ptr(int) src/./prevector.h:196
          NEW_FUNC[2/58]: 0x557847cfebb0 in prevector<28u, unsigned char, unsigned int, int>::indirect_ptr(int) src/./prevector.h:161
          NEW_FUNC[3/58]: 0x557847d03990 in uint256::uint256() src/./uint256.h:123
          NEW_FUNC[0/3]: 0x557847d47430 in void CScript::SerializationOp<CDataStream, CSerActionUnserialize>(CDataStream&, CSerActionUnserialize) src/./script/script.h:418
          NEW_FUNC[1/3]: 0x557847d47730 in void Unserialize_impl<CDataStream, 28u, unsigned char>(CDataStream&, prevector<28u, unsigned char, unsigned int, int>&, unsigned char const&) src/./serialize.h:666
          NEW_FUNC[2/3]: 0x557847d60dd0 in CDataStream& CDataStream::operator>><CScript&>(CScript&) src/./streams.h:460
          NEW_FUNC[1/78]: 0x557847cffae0 in prevector<28u, unsigned char, unsigned int, int>::item_ptr(int) const src/./prevector.h:197
          NEW_FUNC[2/78]: 0x557847cffd30 in prevector<28u, unsigned char, unsigned int, int>::indirect_ptr(int) const src/./prevector.h:162
          NEW_FUNC[0/1]: 0x557847d65f90 in OverrideStream<CDataStream>& OverrideStream<CDataStream>::operator>><unsigned char&>(unsigned char&) src/./streams.h:46
          NEW_FUNC[0/3]: 0x557847d470e0 in void SerReadWriteMany<CDataStream, CScript&>(CDataStream&, CSerActionUnserialize, CScript&) src/./serialize.h:989
          NEW_FUNC[1/3]: 0x557847d4ac50 in void CTxOut::SerializationOp<CDataStream, CSerActionUnserialize>(CDataStream&, CSerActionUnserialize) src/./primitives/transaction.h:149
          NEW_FUNC[2/3]: 0x557847d5f860 in void UnserializeFromVector<CDataStream, CTxOut>(CDataStream&, CTxOut&) src/./script/sign.h:90
          NEW_FUNC[0/1]: 0x557847d60840 in void UnserializeFromVector<CDataStream, int>(CDataStream&, int&) src/./script/sign.h:90
          NEW_FUNC[0/1]: 0x557847d41010 in CMutableTransaction::HasWitness() const src/./primitives/transaction.h:398
  stat::number_of_executed_units: 13615
  stat::average_exec_per_sec:     1237
  stat::new_units_added:          357
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              446
  Number of unique code paths taken during fuzzing round: 152

  Testing fuzzer psbt_output_deserialize during 10 second(s)
  A subset of reached functions:
          NEW_FUNC[0/27]: 0x55c9347e5940 in prevector<28u, unsigned char, unsigned int, int>::~prevector() src/./prevector.h:456
          NEW_FUNC[5/27]: 0x55c93483eca0 in unsigned long ReadCompactSize<CDataStream>(CDataStream&) src/./serialize.h:290
          NEW_FUNC[6/27]: 0x55c934850ee0 in void Unserialize_impl<CDataStream, unsigned char, std::allocator<unsigned char> >(CDataStream&, std::vector<unsigned char, std::allocator<unsigned char> >&, unsigned char const&) src/./serialize.h:746
          NEW_FUNC[14/27]: 0x55c934858500 in PSBTOutput::PSBTOutput() src/./psbt.h:281
          NEW_FUNC[15/27]: 0x55c934858870 in CDataStream& CDataStream::operator>><PSBTOutput&>(PSBTOutput&) src/./streams.h:460
          NEW_FUNC[0/1]: 0x55c934800100 in prevector<28u, unsigned char, unsigned int, int>::size() const src/./prevector.h:277
          NEW_FUNC[0/4]: 0x55c934849840 in void CScript::SerializationOp<CDataStream, CSerActionUnserialize>(CDataStream&, CSerActionUnserialize) src/./script/script.h:418
          NEW_FUNC[1/4]: 0x55c934849b40 in void Unserialize_impl<CDataStream, 28u, unsigned char>(CDataStream&, prevector<28u, unsigned char, unsigned int, int>&, unsigned char const&) src/./serialize.h:666
          NEW_FUNC[2/4]: 0x55c934849f70 in prevector<28u, unsigned char, unsigned int, int>::resize(unsigned int) src/./prevector.h:311
          NEW_FUNC[3/4]: 0x55c93485dc60 in CDataStream& CDataStream::operator>><CScript&>(CScript&) src/./streams.h:460
          NEW_FUNC[0/3]: 0x55c934800310 in prevector<28u, unsigned char, unsigned int, int>::capacity() const src/./prevector.h:295
          NEW_FUNC[1/3]: 0x55c934800d70 in prevector<28u, unsigned char, unsigned int, int>::item_ptr(int) src/./prevector.h:196
          NEW_FUNC[2/3]: 0x55c934849d40 in prevector<28u, unsigned char, unsigned int, int>::resize_uninitialized(unsigned int) src/./prevector.h:381
          NEW_FUNC[0/1]: 0x55c93485ddd0 in void DeserializeHDKeypaths<CDataStream>(CDataStream&, std::vector<unsigned char, std::allocator<unsigned char> > const&, std::map<CPubKey, KeyOriginInfo, std::less<CPubKey>, std::allocator<std::pair<CPubKey const, KeyOriginInfo> > >&) src/./script/sign.h:103
  stat::number_of_executed_units: 19130
  stat::average_exec_per_sec:     1739
  stat::new_units_added:          195
  stat::slowest_unit_time_sec:    0
  stat::peak_rss_mb:              411
  Number of unique code paths taken during fuzzing round: 64

  Tested fuzz harnesses seem to work as expected.
  ```

Top commit has no ACKs.

Tree-SHA512: baf1630a6e438d02d33c77b9e602c99546b9e8d83705e67c2749e0600039c37707cdf419cee19282f069e8d787c536ed4960f9c47e93bd0f0251495b83780ada

5 files changed, 184 insertions, 0 deletions

diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index 6edbe77776..0225edf29e 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -33,10 +33,14 @@ FUZZ_TARGETS = \
   test/fuzz/messageheader_deserialize \
   test/fuzz/netaddr_deserialize \
   test/fuzz/out_point_deserialize \
+  test/fuzz/parse_hd_keypath \
   test/fuzz/parse_iso8601 \
   test/fuzz/partial_merkle_tree_deserialize \
   test/fuzz/partially_signed_transaction_deserialize \
   test/fuzz/prefilled_transaction_deserialize \
+  test/fuzz/parse_numbers \
+  test/fuzz/parse_script \
+  test/fuzz/parse_univalue \
   test/fuzz/psbt \
   test/fuzz/psbt_input_deserialize \
   test/fuzz/psbt_output_deserialize \
@@ -94,6 +98,7 @@ FUZZ_SUITE_LD_COMMON = \
  $(LIBTEST_UTIL) \
  $(LIBBITCOIN_CONSENSUS) \
  $(LIBBITCOIN_CRYPTO) \
+ $(LIBBITCOIN_CLI) \
  $(LIBUNIVALUE) \
  $(LIBLEVELDB) \
  $(LIBLEVELDB_SSE42) \
@@ -518,6 +523,30 @@ test_fuzz_tx_out_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
 test_fuzz_tx_out_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 test_fuzz_tx_out_LDADD = $(FUZZ_SUITE_LD_COMMON)
 
+test_fuzz_parse_hd_keypath_SOURCES = $(FUZZ_SUITE) test/fuzz/parse_hd_keypath.cpp
+test_fuzz_parse_hd_keypath_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+test_fuzz_parse_hd_keypath_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
+test_fuzz_parse_hd_keypath_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+test_fuzz_parse_hd_keypath_LDADD = $(FUZZ_SUITE_LD_COMMON)
+
+test_fuzz_parse_script_SOURCES = $(FUZZ_SUITE) test/fuzz/parse_script.cpp
+test_fuzz_parse_script_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+test_fuzz_parse_script_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
+test_fuzz_parse_script_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+test_fuzz_parse_script_LDADD = $(FUZZ_SUITE_LD_COMMON)
+
+test_fuzz_parse_numbers_SOURCES = $(FUZZ_SUITE) test/fuzz/parse_numbers.cpp
+test_fuzz_parse_numbers_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+test_fuzz_parse_numbers_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
+test_fuzz_parse_numbers_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+test_fuzz_parse_numbers_LDADD = $(FUZZ_SUITE_LD_COMMON)
+
+test_fuzz_parse_univalue_SOURCES = $(FUZZ_SUITE) test/fuzz/parse_univalue.cpp
+test_fuzz_parse_univalue_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+test_fuzz_parse_univalue_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
+test_fuzz_parse_univalue_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+test_fuzz_parse_univalue_LDADD = $(FUZZ_SUITE_LD_COMMON)
+
 endif # ENABLE_FUZZ
 
 nodist_test_test_bitcoin_SOURCES = $(GENERATED_TEST_FILES)
diff --git a/src/test/fuzz/parse_hd_keypath.cpp b/src/test/fuzz/parse_hd_keypath.cpp
new file mode 100644
index 0000000000..9a23f4b2d4
--- /dev/null
+++ b/src/test/fuzz/parse_hd_keypath.cpp
@@ -0,0 +1,13 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <test/fuzz/fuzz.h>
+#include <util/bip32.h>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string keypath_str(buffer.begin(), buffer.end());
+    std::vector<uint32_t> keypath;
+    (void)ParseHDKeypath(keypath_str, keypath);
+}
diff --git a/src/test/fuzz/parse_numbers.cpp b/src/test/fuzz/parse_numbers.cpp
new file mode 100644
index 0000000000..59f89dc9fb
--- /dev/null
+++ b/src/test/fuzz/parse_numbers.cpp
@@ -0,0 +1,35 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <test/fuzz/fuzz.h>
+#include <util/moneystr.h>
+#include <util/strencodings.h>
+
+#include <string>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string random_string(buffer.begin(), buffer.end());
+
+    CAmount amount;
+    (void)ParseMoney(random_string, amount);
+
+    double d;
+    (void)ParseDouble(random_string, &d);
+
+    int32_t i32;
+    (void)ParseInt32(random_string, &i32);
+    (void)atoi(random_string);
+
+    uint32_t u32;
+    (void)ParseUInt32(random_string, &u32);
+
+    int64_t i64;
+    (void)atoi64(random_string);
+    (void)ParseFixedPoint(random_string, 3, &i64);
+    (void)ParseInt64(random_string, &i64);
+
+    uint64_t u64;
+    (void)ParseUInt64(random_string, &u64);
+}
diff --git a/src/test/fuzz/parse_script.cpp b/src/test/fuzz/parse_script.cpp
new file mode 100644
index 0000000000..21ac1aecf3
--- /dev/null
+++ b/src/test/fuzz/parse_script.cpp
@@ -0,0 +1,16 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <core_io.h>
+#include <script/script.h>
+#include <test/fuzz/fuzz.h>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string script_string(buffer.begin(), buffer.end());
+    try {
+        (void)ParseScript(script_string);
+    } catch (const std::runtime_error&) {
+    }
+}
diff --git a/src/test/fuzz/parse_univalue.cpp b/src/test/fuzz/parse_univalue.cpp
new file mode 100644
index 0000000000..3ad112dbad
--- /dev/null
+++ b/src/test/fuzz/parse_univalue.cpp
@@ -0,0 +1,91 @@
+// Copyright (c) 2009-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <chainparams.h>
+#include <core_io.h>
+#include <rpc/client.h>
+#include <rpc/util.h>
+#include <test/fuzz/fuzz.h>
+#include <util/memory.h>
+
+#include <limits>
+#include <string>
+
+void initialize()
+{
+    static const auto verify_handle = MakeUnique<ECCVerifyHandle>();
+    SelectParams(CBaseChainParams::REGTEST);
+}
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string random_string(buffer.begin(), buffer.end());
+    bool valid = true;
+    const UniValue univalue = [&] {
+        try {
+            return ParseNonRFCJSONValue(random_string);
+        } catch (const std::runtime_error&) {
+            valid = false;
+            return NullUniValue;
+        }
+    }();
+    if (!valid) {
+        return;
+    }
+    try {
+        (void)ParseHashO(univalue, "A");
+        (void)ParseHashO(univalue, random_string);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseHashV(univalue, "A");
+        (void)ParseHashV(univalue, random_string);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseHexO(univalue, "A");
+        (void)ParseHexO(univalue, random_string);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseHexUV(univalue, "A");
+        (void)ParseHexUV(univalue, random_string);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseHexV(univalue, "A");
+        (void)ParseHexV(univalue, random_string);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseSighashString(univalue);
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)AmountFromValue(univalue);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        FlatSigningProvider provider;
+        (void)EvalDescriptorStringOrObject(univalue, provider);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseConfirmTarget(univalue, std::numeric_limits<unsigned int>::max());
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+    try {
+        (void)ParseDescriptorRange(univalue);
+    } catch (const UniValue&) {
+    } catch (const std::runtime_error&) {
+    }
+}