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Don't memcpy the contents of an empty fragment #6223

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Don't memcpy the contents of an empty fragment #6223

wants to merge 1 commit into from

Commits on May 11, 2018

  1. Don't memcpy the contents of an empty fragment 

    In DTLS if we have buffered a fragment for a zero length message (e.g.
ServerHelloDone) then, when we unbuffered the fragment, we were attempting
to memcpy the contents of the fragment which is zero length and a NULL
pointer. This is undefined behaviour. We should check first whether we
have a zero length fragment.

Fixes a travis issue.

[extended tests]
    @mattcaswell
    mattcaswell committed May 11, 2018
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