forked from cerc-io/plugeth
core/vm: fix overflow in gas calculation formula
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@ -17,7 +17,6 @@
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package vm
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import (
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gmath "math"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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@ -28,15 +27,20 @@ import (
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// memoryGasCosts calculates the quadratic gas for memory expansion. It does so
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// only for the memory region that is expanded, not the total memory.
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func memoryGasCost(mem *Memory, newMemSize uint64) (uint64, error) {
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// The maximum that will fit in a uint64 is max_word_count - 1
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// anything above that will result in an overflow.
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if newMemSize > gmath.MaxUint64-32 {
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return 0, errGasUintOverflow
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}
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if newMemSize == 0 {
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return 0, nil
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}
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// The maximum that will fit in a uint64 is max_word_count - 1
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// anything above that will result in an overflow.
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// Additionally, a newMemSize which results in a
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// newMemSizeWords larger than 0x7ffffffff will cause the square operation
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// to overflow.
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// The constant 0xffffffffe0 is the highest number that can be used without
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// overflowing the gas calculation
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if newMemSize > 0xffffffffe0 {
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return 0, errGasUintOverflow
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}
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newMemSizeWords := toWordSize(newMemSize)
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newMemSize = newMemSizeWords * 32
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