[exim-dev] [Bug 2533] New: Crashes using ${tr ...}

https://bugs.exim.org/show_bug.cgi?id=2533

            Bug ID: 2533
           Summary: Crashes using ${tr ...}
           Product: Exim
           Version: 4.93
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: String expansion
          Assignee: unallocated@???
          Reporter: heiko@???
                CC: exim-dev@???

Created attachment 1278
--> https://bugs.exim.org/attachment.cgi?id=1278&action=edit
gdb backtrace

Exim 4.93.04 (and HEAD of master) crashes if ${tr} is used after $header_...
within ${sg} or ${tr}.

Can be reproduced with:

$ exim -be '${sg{$h_example:${tr{}{}{}}}{}{}}'
Segmentation fault

$exim -be '${tr{$h_example:${tr{}{}{}}{}{}}'
Segmentation fault

It crashes even without arguments for ${tr} which is a syntax error:

$exim -be '${sg{$h_example:${tr}}{}{}}'
Segmentation fault

git bisect points to commit acec9514b1006e352ef283f205ecec75a9b6ff0d
(2017-10-12). Older versions of exim evaluates without problems. Checked with
Exim 4.85.

gdb backtrace attached.

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