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Add a changelog for the STACK fixes

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Nick Mathewson 2017-11-26 17:37:36 -05:00
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o Minor bugfixes (correctness):
- Fix several places in our codebase where a C compiler would be likely
to eliminate a check, based on assuming that undefined behavior had not
happened elsewhere in the code. These cases are usually a sign of
redundant checking, or dubious arithmetic. Found by Georg Koppen using
the "STACK" tool from Wang, Zeldovich, Kaashoek, and
Solar-Lezama. Fixes bug 24423; bugfix on various Tor versions.