STINNER Victor <victor.stin...@haypocalc.com> added the comment:

There was a similar bug which was declared as a vulnerability in the
Linux kernel:
http://isc.sans.edu/diary.html?storyid=6820

GCC has an option to disable this optimization: -fno-delete-null-pointer-checks.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13874>
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