Auto merge of #4179 - defuse:fuzz-addrman, r=str4d

Add More Fuzzing Targets

src/fuzzing/CheckBlock/fuzz.cpp

@@ -0,0 +1,29 @@
+#include "consensus/validation.h"
+#include "chainparams.h"
+
+int main (int argc, char *argv[]) {
+    int retval = 0;
+
+    SelectParams(CBaseChainParams::MAIN);
+
+    CBlock block;
+    CAutoFile filein(fopen(argv[1], "rb"), SER_DISK, CLIENT_VERSION);
+    try {
+        filein >> block;
+    } catch (const std::exception& e) {
+        return -1;
+    }
+
+    // We don't load the SNARK parameters because it's too slow. This means that
+    // valid blocks with shielded transactions will generate a crash.
+
+    const CChainParams& chainparams = Params();
+    auto verifier = libzcash::ProofVerifier::Disabled();
+    CValidationState state;
+    // We don't check the PoW or Merkle tree root in order to reach more code.
+    if (!CheckBlock(block, state, chainparams, verifier, false, false)) {
+        retval = -1;
+    }
+
+    return retval;
+}

src/fuzzing/DeserializeAddrMan/fuzz.cpp

@@ -0,0 +1,13 @@
+#include "addrman.h"
+#include "streams.h"
+
+int main (int argc, char *argv[]) {
+    CAddrMan addrman;
+    CAutoFile filein(fopen(argv[1], "rb"), SER_DISK, CLIENT_VERSION);
+    try {
+        filein >> addrman;
+        return 0;
+    } catch (const std::exception&) {
+        return -1;
+    }
+}

src/fuzzing/ReadFeeEstimates/fuzz.cpp

@@ -0,0 +1,13 @@
+#include "txmempool.h"
+
+int main (int argc, char *argv[]) {
+    CFeeRate rate;
+    CTxMemPool mempool(rate);
+    CAutoFile est_filein(fopen(argv[1], "rb"), SER_DISK, CLIENT_VERSION);
+
+    if (mempool.ReadFeeEstimates(est_filein)) {
+        return 0;
+    } else {
+        return -1;
+    }
+}