[Webkit-unassigned] [Bug 206572] KeyedDecoderGeneric crashes when it accesses a data with empty string key.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206572

--- Comment #4 from Takashi Komori <Takashi.Komori at sony.com> ---
(In reply to Fujii Hironori from comment #3)
> How did you find this bug? Is this a real use case? empty string key.

This crash occurred and found when I tried to decode broken encoded data (zero filled from middle) by chance.
So I think it doesn't occur in normal scenarios.

To avoid decoding collapsed data, I tried to verify encoded data by using Decoder::verifyChecksum (PersistentDecoder.cpp)
But it didn't work because we can't verify before all decoding is done.
Persistence::Decoder calculates checksum while decoding data.

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