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OpenSSL heartbeat bug patch (CVE-2014-0160):

> A missing bounds check in the handling of the TLS heartbeat extension can be used to reveal up to 64k of memory to a connected client or server.

Can someone explain which part of the code contains the bug and why it is a bug?

Amelek is being a bit harsh or just plain wrong; I learned a few days ago that checking malloc's return value means almost nothing:

OpenSSL Heartbeat Code