[16095] in Kerberos-V5-bugs

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[krbdev.mit.edu #8726] Directly dereference the pointer certname

daemon@ATHENA.MIT.EDU (Greg Hudson via RT)
Fri Aug 10 11:02:42 2018

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From: "Greg Hudson via RT" <rt-comment@KRBDEV-PROD-APP-1.mit.edu>
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Date: Fri, 10 Aug 2018 11:02:30 -0400 (EDT)
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parse_fs_options() checks for an empty input, so may be assuming that 
strtok_r() won't return null the first time.  I found experimentally 
that it does so if the input is "," (the delimiter).  So we can make 
this code perform a null deref with:

  pkinit_identities = FILE:,
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