Review Request 128761: Fix crash when using QProxyStyle and exit()

[Peter Wu]

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https://git.reviewboard.kde.org/r/128761/
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Review request for Plasma, David Edmundson, David Faure, and Hugo Pereira Da Costa.


Bugs: 356940
    https://bugs.kde.org/show_bug.cgi?id=356940


Repository: oxygen


Description
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Fix crash when using QProxyStyle and exit()

Do not delete all style instances which we create, restrict ourselves to
the first instance. I have no idea if the delete hack is still needed,
but let's keep it until it is certain that it is unneeded.

Copied from breeze patch https://git.reviewboard.kde.org/r/128760/


Diffs
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  kstyle/oxygenstyleplugin.cpp 70b90d9 

Diff: https://git.reviewboard.kde.org/r/128761/diff/


Testing
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Started `QT_STYLE_OVERRIDE=oxygen LD_LIBRARY_PATH=... QT_PLUGIN_PATH=... wireshark -o` (an invalid option that triggers `exit(1)`) and observe a heap-use-after free similar to the one reported in the bug. Apply this patch, rebuild oxygen and notice that the crash is fixed.


Thanks,

Peter Wu

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