[Users] [Bug 4507] New: Hangs ON Displaying Certain Very Specific Emails

[noreply at thewildbeast.co.uk]

https://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4507

            Bug ID: 4507
           Summary: Hangs ON Displaying Certain Very Specific Emails
           Product: Claws Mail (GTK3)
           Version: 3.99.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: UI/Message View
          Assignee: users at lists.claws-mail.org
          Reporter: timp at timp.com.au

Created attachment 2224
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https://www.thewildbeast.co.uk/claws-mail/bugzilla/attachment.cgi?id=2224&action=edit
Example Messages in a Zip file.

For some reason a couple of specific emails (from freelancer.com) cause Claws
Mail to hang with 100% CPU when I view them.

Sometimes I have to switch back and forth between the `text/plain` display and
the `message/rfc822` display to cause the hang, sometimes it happens as soon as
I open the message.

I've tested this on both 3.17.8 and 3.18.0, on Slackware 64 Current (Kernal
5.12.14).

The attached messages are examples of it. `1` hangs, but `2` and `3` don't.

It's rather weird, it seems to be related to the text body and to the reply-to
header.

If I delete a single line from the text body it stops it hanging, or if I
delete the reply-to header, but I can delete other headers with out fixing the
problem (I did delete most of the headers from the file to make a simpler
example).

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