[Webkit-unassigned] [Bug 205945] New: Instruction.h: Multiplication result converted to larger type

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205945

            Bug ID: 205945
           Summary: Instruction.h: Multiplication result converted to
                    larger type
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

Summary:
Instruction.h: Multiplication result converted to larger type: Multiplication result may overflow 'unsigned int' before it is converted to 'unsigned long'.

    template<typename Traits = JSOpcodeTraits>
    size_t size() const
    {
        auto sizeShiftAmount = this->sizeShiftAmount<Traits>();
        auto prefixSize = sizeShiftAmount ? 1 : 0;
        auto operandSize = 1 << sizeShiftAmount;
        size_t sizeOfBytecode = 1;
        return sizeOfBytecode + (Traits::opcodeLengths[opcodeID<Traits>()] - 1) * operandSize + prefixSize;
Multiplication result may overflow 'unsigned int' before it is converted to 'unsigned long'.
    }

fix: Change operandSize to size_t.

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