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April 05-07 - Mercurial Paris Conference 2023 - One day of workshop dedicated to Heptapod and Mercurial usage and workflow. There are still places available for both workshops and talks!

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  • Issues
  • #3065
Closed
Open
Issue created Aug 31, 2019 by Ronan Lamy@rlamyOwner

range() with large step causes undefined behaviour

With positive step, range(start, stop, step) translates roughly like:

def range(start, stop, step):
    cur = start
    while cur < stop:
        yield cur
        cur += step

Signed integer overflow, which is undefined behaviour in C, may happen on the line cur += step, e.g. if start + step > sys.maxint.

Note: this caused the issue fixed in be2a55c81f26

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