[tor-bugs] #23837 [Core Tor/Tor]: Tor crashing after clicking "Cancel" in file download dialog

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#23837: Tor crashing after clicking "Cancel" in file download dialog
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     Reporter:  requirement   |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:  Tor: 0.3.1.7
     Severity:  Normal        |   Keywords:  crash
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 Steps to reproduce:
 * log in to your ProtonMail account
 * go to Settings -> Keys
 * click on "PUBLIC KEY" to download it
 * as soon as the dialog pop up, click "Cancel"
 * tor will Crash

 Information:
 Happened both on Windows 10 and Linux openSUSE.
 Fully updated Tor Browser 7.0.6 with no custom addons.
 I asked my friend from another country to check it and she confirmed it.

 Worth mentioning is that when I actually click "Download" instead of
 "Cancel" the download never finishes. In Downloads there's "unknown time
 remaining" with 0 B/s. That might be actually ProtonMail's bug but I first
 wanted to report the Tor crash because if not being able to download the
 key is ProtonMail's bug and it caused Tor bug and they fixed it, we might
 not be able to reproduce Tor bug anymore.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23837>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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