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[SECURITY] Prevent rhostname array overflow #31

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[SECURITY] Prevent rhostname array overflow #31

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Commits on Mar 7, 2020

  1. vallen is verified to be less than len, therefore, it can never 

    be the case that `vallen >= len + sizeof(rhostname)`.

This PR fixes the check so the `rhostname` array does not overflow.

Reported-by: Github Security Lab <securitylab@github.com>
Signed-off-by: Alvaro Muñoz <pwntester@github.com>
    @ghsecuritylab
    ghsecuritylab committed Mar 7, 2020
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