[Bug 33404] CAJViewer 7.2 crashes while open a file

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=33404

Simon Rettberg <simon.rettberg at rz.uni-freiburg.de> changed:

           What    |Removed                     |Added
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                 CC|                            |simon.rettberg at rz.uni-freib
                   |                            |urg.de

--- Comment #15 from Simon Rettberg <simon.rettberg at rz.uni-freiburg.de> ---
I ran into the same crash on some documents. About 30% of the .caj files I have
crash CAJViewer, the rest works fine.

Here's a quick workaround for anyone interested. This fixes the one problem
mentioned by fangendou in the original posting where CAJViewer crashes and
displays the exception in its own window, showing a minidump.

We're pulling a very dirty trick here by just patching out the instructions
leading to the crash.

If you see it shows this part in the error message:
Instruction:  8B 01 FF 50 24 0F BF ** ** ** ** ** **...
then this trick is for you, otherwise this has nothing to do with your problem.

Open the ReaderEx.dll from CAJViewer's directory in a hex editor (eg. hexedit
for terminal) and search for the bytes 8b01ff50240fbf (press / in hexedit).
There should be exactly one match in the file. Then replace the first 5 bytes
of the match by 90, so it looks like 90909090900fbf. Save the file (Ctrl-X in
hexedit) and run CAJVieweru.exe. The problem should be gone.

Please be aware that this is a workaround that only works by pure chance. What
this actually does is replace a few instructions in the machine code with
NO-OPs, essentially wiping out what appears to be a method call on some object
that happens to be a null pointer in those cases where it crashed. I have no
idea what this function call is supposed to do. Keep this in mind in case you
encounter something else is now broken that might have worked before. I'm only
interested in reading some *.caj files which is working fine now, no side
effects noticed so far.

Tested with CAJViewer 7.2.0 Build 103
wine-1.8.7 (Ubuntu 1.8.7-1ubuntu1)

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