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-rw-r--r--src/psbt.cpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/psbt.cpp b/src/psbt.cpp
index 9ede62efdf..ed32465872 100644
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -66,8 +66,11 @@ bool PartiallySignedTransaction::AddOutput(const CTxOut& txout, const PSBTOutput
bool PartiallySignedTransaction::GetInputUTXO(CTxOut& utxo, int input_index) const
{
PSBTInput input = inputs[input_index];
- int prevout_index = tx->vin[input_index].prevout.n;
+ uint32_t prevout_index = tx->vin[input_index].prevout.n;
if (input.non_witness_utxo) {
+ if (prevout_index >= input.non_witness_utxo->vout.size()) {
+ return false;
+ }
utxo = input.non_witness_utxo->vout[prevout_index];
} else if (!input.witness_utxo.IsNull()) {
utxo = input.witness_utxo;
@@ -255,6 +258,9 @@ bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction&
if (input.non_witness_utxo) {
// If we're taking our information from a non-witness UTXO, verify that it matches the prevout.
COutPoint prevout = tx.vin[index].prevout;
+ if (prevout.n >= input.non_witness_utxo->vout.size()) {
+ return false;
+ }
if (input.non_witness_utxo->GetHash() != prevout.hash) {
return false;
}