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fix bound check in code chunking

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This commit is contained in:
Guillaume Ballet
2021-11-21 15:48:50 +01:00
parent 5ca990184f
commit 6d40e11fe3
1 changed files with 3 additions and 2 deletions
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5
core/vm/instructions.go
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@ -389,12 +389,13 @@ func touchEachChunks(start, end uint64, code []byte, contract *Contract, evm *EV
for chunk := start / 31; chunk <= end/31 && chunk <= uint64(len(code))/31; chunk++ { for chunk := start / 31; chunk <= end/31 && chunk <= uint64(len(code))/31; chunk++ {
index := trieUtils.GetTreeKeyCodeChunk(contract.Address().Bytes(), uint256.NewInt(chunk)) index := trieUtils.GetTreeKeyCodeChunk(contract.Address().Bytes(), uint256.NewInt(chunk))
count := uint64(0) count := uint64(0)
end := (chunk + 1) * 31
// Look for the first code byte (i.e. no pushdata) // Look for the first code byte (i.e. no pushdata)
for ; count < 31 && !contract.IsCode(chunk*31+count); count++ { for ; count < 31 && end+count < uint64(len(contract.Code)) && !contract.IsCode(chunk*31+count); count++ {
} }
var value [32]byte var value [32]byte
value[0] = byte(count) value[0] = byte(count)
end := (chunk + 1) * 31
if end > uint64(len(code)) { if end > uint64(len(code)) {
end = uint64(len(code)) end = uint64(len(code))
} }