[tor-bugs] #23291 [Core Tor/Tor]: unintentional undefined behaviore in test-memwipe.c

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#23291: unintentional undefined behaviore in test-memwipe.c
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.2.9.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 While working on #22839, snoek found a bug in test-memwipe.c:

 >The last test, test_memwipe, segfaulted. This only happened with Rust
 built in. It turns out this was caused by the uninitialized buf in
 check_heap_buffer being smaller than the mem addresses being scanned. I
 know we're doing some dirty stuff there, but I don't think trying to read
 past the length of the buffer was intended. At least to me it seems fair
 enough for the program to segfault. I put in the obvious fix, which might
 be horribly wrong.


 It looks fine to me, so I'm going to give it a bug number and backport it.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23291>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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