GameManager::GetISOGameID() and GameInfoCache::ReadFileToString() resized host
buffers directly from the size reported by the ISO directory record, which is
untrusted. A crafted image can advertise a huge PARAM.SFO or icon and cause an
excessive allocation just from inspecting the file in the game list.
Cap both at a size well above anything real, and skip the read instead. Follows
the pattern PSARUnpack::ReadWholeFile already uses.
Taken from #22209.
Acts1631
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