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fix boundary condition check in PUSH32

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This commit is contained in:
Guillaume Ballet 2021-11-22 22:22:04 +01:00
parent 6d40e11fe3
commit 03dbc0a210
1 changed files with 4 additions and 2 deletions
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6
core/vm/instructions.go
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@ -964,8 +964,10 @@ func makePush(size uint64, pushByteSize int) executionFunc {
interpreter.evm.TxContext.Accesses.TouchAddressAndChargeGas(index, nil)
// in the case of PUSH32, the end data might be two chunks away,
// so also get the middle chunk.
if pushByteSize == 32 {
// so also get the middle chunk. There is a boundary condition
// check (endMin > 2) in the case the code is a single PUSH32
// insctruction, whose immediate are just 0s.
if pushByteSize == 32 && endMin > 2 {
chunk = uint64(endMin-2) / 31
count = uint64(0)
// Look for the first code byte (i.e. no pushdata)