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Fix potential overflow of unsigned type in for loop #6902

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zhichao-cao
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x.size() -1 or y - 1 can overflow to an extremely large value when x.size() pr y is 0 when they are unsigned type. The end condition of i in the for loop will be extremely large, potentially causes segment fault. Fix them.

test plan: pass make asan_check

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@zhichao-cao has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

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LGTM.

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@zhichao-cao merged this pull request in 2adb7e3.

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