[Bug 1397340] Re: Integer overflow when processing giant field values

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** Branch linked: lp:whoopsie

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https://bugs.launchpad.net/bugs/1397340

Title:
  Integer overflow when processing giant field values

Status in whoopsie package in Ubuntu:
  In Progress

Bug description:
  Ubuntu release: 12.04
  Package version: 0.1.33

  When parsing fields in a crash report file, whoopsie will reallocate
  the value buffer when appending continuation lines. The current length
  of the buffer is computed by pointer arithmetic and the result stored
  in a signed integer. If the field value length reaches 2GB, then this
  value will overflow, and become negative. This will then cause
  whoopsie itself to abort, as it tries to allocate a huge amount of
  memory.

  I would expect whoopsie to cope with such large input (which may be
  generated as the result of a memory-hungry process crashing and
  creating a very large compressed+base64-encoded CoreDump).

  By inspection, I see that this issue is still present in current
  development versions: http://bazaar.launchpad.net/~ubuntu-
  branches/ubuntu/vivid/whoopsie/vivid/view/head:/src/whoopsie.c#L402

  I've attached a patch (created against the 0.1.33 sources, but should
  apply with minimal issues against later versions), that resolves the
  immediate issue. There's a more general question about the sanity of
  loading the entire crash file into memory, too (particularly as the
  CoreDump is never used unless the server requests it).

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