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btcwallet: add transaction outputs bounds check to FetchInputInfo #4302

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Merged
Roasbeef merged 1 commit into from
May 22, 2020
Merged

btcwallet: add transaction outputs bounds check to FetchInputInfo #4302

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5 changes: 5 additions & 0 deletions lnwallet/btcwallet/signer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,11 @@ func (b *BtcWallet) FetchInputInfo(prevOut *wire.OutPoint) (*lnwallet.Utxo, erro
// we actually have control of this output. We do this because the check
// above only guarantees that the transaction is somehow relevant to us,
// like in the event of us being the sender of the transaction.
numOutputs := uint32(len(txDetail.TxRecord.MsgTx.TxOut))
if prevOut.Index >= numOutputs {
return nil, fmt.Errorf("invalid output index %v for "+
"transaction with %v outputs", prevOut.Index, numOutputs)
}
pkScript := txDetail.TxRecord.MsgTx.TxOut[prevOut.Index].PkScript
if _, err := b.fetchOutputAddr(pkScript); err != nil {
return nil, err
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