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fuzz: Fix off-by-one in package_rbf target

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Github-Pull: #32122
Rebased-From: fa5674c264
This commit is contained in:
MarcoFalke 2025-03-22 07:36:41 +01:00 • committed by glozow
parent a3060483fa
commit 288163ea0f
1 changed files with 7 additions and 8 deletions
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15
src/test/fuzz/rbf.cpp
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@ -1,4 +1,4 @@
// Copyright (c) 2020-2022 The Bitcoin Core developers
// Copyright (c) 2020-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
@ -108,7 +108,7 @@ FUZZ_TARGET(package_rbf, .init = initialize_package_rbf)
// Add a bunch of parent-child pairs to the mempool, and remember them.
std::vector<CTransaction> mempool_txs;
size_t iter{0};
uint32_t iter{0};
// Keep track of the total vsize of CTxMemPoolEntry's being added to the mempool to avoid overflow
// Add replacement_vsize since this is added to new diagram during RBF check
@ -116,9 +116,8 @@ FUZZ_TARGET(package_rbf, .init = initialize_package_rbf)
if (!replacement_tx) {
return;
}
assert(iter <= g_outpoints.size());
replacement_tx->vin.resize(1);
replacement_tx->vin[0].prevout = g_outpoints[iter++];
replacement_tx->vin[0].prevout = g_outpoints.at(iter++);
CTransaction replacement_tx_final{*replacement_tx};
auto replacement_entry = ConsumeTxMemPoolEntry(fuzzed_data_provider, replacement_tx_final);
int32_t replacement_vsize = replacement_entry.GetTxSize();
@ -126,13 +125,13 @@ FUZZ_TARGET(package_rbf, .init = initialize_package_rbf)
LOCK2(cs_main, pool.cs);
LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), NUM_ITERS)
{
while (fuzzed_data_provider.ConsumeBool()) {
if (iter >= NUM_ITERS) break;
// Make sure txns only have one input, and that a unique input is given to avoid circular references
CMutableTransaction parent;
assert(iter <= g_outpoints.size());
parent.vin.resize(1);
parent.vin[0].prevout = g_outpoints[iter++];
parent.vin[0].prevout = g_outpoints.at(iter++);
parent.vout.emplace_back(0, CScript());
mempool_txs.emplace_back(parent);