tor/changes/memarea_overflow

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o Minor bugfixes (pointer arithmetic):
- Fix a bug in memarea_alloc() that could have resulted in remote heap
write access, if Tor had ever passed an unchecked size to
memarea_alloc(). Fortunately, all the sizes we pass to memarea_alloc()
are pre-checked to be less than 128 kilobytes. Fixes bug 19150; bugfix
on 0.2.1.1-alpha. Bug found by Guido Vranken.