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- Subject: Re: [PATCH] Loop Overflow Bug Fix
- From: Paige DePol <lual@...>
- Date: Wed, 15 Nov 2017 14:28:19 -0600
Roberto Ierusalimschy <firstname.lastname@example.org> wrote:
>> I have produced a very small patch which only makes adjustments in lvm.c to the OP_FORLOOP and OP_FORPREP opcodes to solve the issue of the edge case where math.maxinteger or math.mininteger are used, or where the sign bit overflowed.
>> These two changes fix all the recently described edge cases with for loops so far as I can tell, as well as remaining compatible with all tests in the Lua test suite. Please let me know if I have overlooked something with how this code performs, thanks!
> Did you test corner cases around mininteger limits, too (with positive
> steps)? In particular, what happens if the subtraction (limit - step)
> -- Roberto
Apparently I did not, thank you for mentioning those tests, Roberto.
I am tinkering with my patch to add detection for these particular cases.