WebCoreArgumentCoders should check bufferIsLargeEnoughToContain before allocating buffers

[Fujii Hironori]

WebCoreArgumentCoders should check bufferIsLargeEnoughToContain before allocating buffers

This is a sub-task of Bug 209131.
Bug 209131 – Don't allocate a buffer with the decoded size without ensuring bufferIsLargeEnoughToContain(size)

[Fujii Hironori]

Created attachment 393822 [details]
Patch

[Fujii Hironori]

Created attachment 393827 [details]
Patch

[Fujii Hironori]

Created attachment 393828 [details]
Patch

[Darin Adler]

Comment on attachment 393828 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=393828&action=review

> Source/WebKit/Shared/WebCoreArgumentCoders.cpp:158
> +    if (!decoder.bufferIsLargeEnoughToContain<unsigned char>(bufferSize))
> +        return false;

This *needs* to be inside the #if USE(UNIX_DOMAIN_SOCKETS) and should be uint8_t, not unsigned char.

> Source/WebKit/Shared/WebCoreArgumentCoders.cpp:199
> +    data.resize(0);

This is not needed. We can and should rely on being passed an empty vector.

> Source/WebKit/Shared/WebCoreArgumentCoders.cpp:202
>          decodeSharedBuffer(decoder, buffer);

Strange and incorrect that this does not check the return result. Should say:

    if (!decodeSharedBuffer(decoder, buffer))
        return false;

[Fujii Hironori]

Thank you for the review. Will fix.

[Fujii Hironori]

Created attachment 393901 [details]
Patch

[Fujii Hironori]

Comment on attachment 393901 [details]
Patch

Clearing flags on attachment: 393901

Committed r258675: <https://trac.webkit.org/changeset/258675>

[Fujii Hironori]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/60615337>