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Malformed crashdump causes OOM by allocating far too much memory #381

@ghost

Description

On the base64 decoded data of TURNUJOnAAAA/2ZmZFlmZmZmZkAKCmZwCrv///8K/wo=, it OOMs when parsing through the minidump::Minidump::read(data) method, and when running minidump-stackwalk (version 0.9.6), I get

# minidump-stackwalk crash.txt          
memory allocation of 45097156624 bytes failed
zsh: abort (core dumped)  minidump-stackwalk crash.txt

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