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script: Change SignatureHash input index check to an assert.

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In the SignatureHash function, the input index must refer to a valid
index. This is not enforced equally in the segwit/non-segwit branches
and should be an assertion rather than returning a error hash.
This commit is contained in:
Jim Posen 2017-09-27 19:49:18 -07:00
parent ef8340d25f
commit 5ddf56045a
1 changed files with 2 additions and 4 deletions
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6
src/script/interpreter.cpp
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@ -1175,6 +1175,8 @@ PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsigned int nIn, int nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache)
{
assert(nIn < txTo.vin.size());
if (sigversion == SIGVERSION_WITNESS_V0) {
uint256 hashPrevouts;
uint256 hashSequence;
@ -1221,10 +1223,6 @@ uint256 SignatureHash(const CScript& scriptCode, const CTransaction& txTo, unsig
}
static const uint256 one(uint256S("0000000000000000000000000000000000000000000000000000000000000001"));
if (nIn >= txTo.vin.size()) {
// nIn out of range
return one;
}
// Check for invalid use of SIGHASH_SINGLE
if ((nHashType & 0x1f) == SIGHASH_SINGLE) {