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Don't calculate tx fees for PSBTs with invalid money values

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In decodepsbt if an invalid amount is seen, don't calculate the fee
but still show the invalid value in the decode.

In analyze psbt, if an invalid amount is seen, set the next step to
be the creator as the creator needs to remake the transaction so that
it is valid.

Github-Pull: #17156
Rebased-From: f1ef7f0aa4
This commit is contained in:
Andrew Chow
2019-10-15 17:15:22 -04:00
committed by Luke Dashjr
parent 178a834687
commit 1cf77a2dc3
3 changed files with 40 additions and 3 deletions
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12
src/node/psbt.cpp
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@@ -2,6 +2,7 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <amount.h>
#include <coins.h>
#include <consensus/tx_verify.h>
#include <node/psbt.h>
@@ -31,6 +32,10 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
// Check for a UTXO
CTxOut utxo;
if (psbtx.GetInputUTXO(utxo, i)) {
if (!MoneyRange(utxo.nValue) || !MoneyRange(in_amt + utxo.nValue)) {
result.SetInvalid(strprintf("PSBT is not valid. Input %u has invalid value", i));
return result;
}
in_amt += utxo.nValue;
input_analysis.has_utxo = true;
} else {
@@ -85,9 +90,16 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
// Get the output amount
CAmount out_amt = std::accumulate(psbtx.tx->vout.begin(), psbtx.tx->vout.end(), CAmount(0),
[](CAmount a, const CTxOut& b) {
if (!MoneyRange(a) || !MoneyRange(b.nValue) || !MoneyRange(a + b.nValue)) {
return CAmount(-1);
}
return a += b.nValue;
}
);
if (!MoneyRange(out_amt)) {
result.SetInvalid(strprintf("PSBT is not valid. Output amount invalid"));
return result;
}
// Get the fee
CAmount fee = in_amt - out_amt;