[tor-bugs] #27740 [Core Tor/Tor]: rust protover_all_supported() returns rust-allocated string in *missing_out

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#27740: rust protover_all_supported() returns rust-allocated string in *missing_out
-------------------------------------------------+-------------------------
 Reporter:  cyberpunks                           |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:  Tor:
                                                 |  0.3.3.1-alpha
 Severity:  Normal                               |     Resolution:
 Keywords:  rust, protover, memory-safety,       |  Actual Points:
  035-must, fast-fix, 033-backport,              |
  034-backport                                   |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by cyberpunks):

 Replying to [comment:3 teor]:
 > As far as I understand it, it may be ok to allocate in Rust and
 deallocate in C, as long as they use the same allocator.
 Right, and currently, they don't.


 > deallocated in Rust (when the function returns),
 It actually isn't.

 > * when missing_out is NULL, Rust still assigns to it
 Nice catch!

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27740#comment:5>
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