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From "Neil Conway" <>
Subject Re: Review Request 40435: Fixed pointer alignment error in IP::create().
Date Thu, 03 Dec 2015 01:45:52 GMT

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(Updated Dec. 3, 2015, 1:45 a.m.)

Review request for mesos, Benjamin Bannier, Ben Mahler, Joris Van Remoortere, Michael Park,
and Niklas Nielsen.


Avoid duplicating code, per mpark. Add comment, per joris.

Bugs: MESOS-3939

Repository: mesos


The previous code took the address of a "struct sockaddr", and then cast the
resulting pointer to "struct sockaddr_storage *". The alignment requirements for
"struct sockaddr_storage *" are more strict than for "struct sockaddr *", and
hence this code produced undefined behavior per ubsan in GCC 5.2.

Along the way, tweak the code to use reinterpret_cast rather than a C-style
cast, and not to unnecessarily cast-away constness.


Diffs (updated)

  3rdparty/libprocess/3rdparty/stout/include/stout/ip.hpp 3e506e1e94ee32e3a19870e1fd72d9968c5f8e67



"make check" on Linux/AMD64 + GCC 5.2 + ubsan; without fix, ubsan reports an error. With fix,
ubsan does not report (this) error.


Neil Conway

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