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svn:author
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asomers
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svn:date
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2018-10-01T16:11:09.034298Z
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V 618
MFC r338216:

tftpd: Fix data corruption bug with netascii

Transferring files in netascii format requires, among other things,
translating all CR characters to a CR,NUL pair. tftpd does this correctly
except when the CR occurs as the last octet of a packet. In that case, it
erroneously drops the NUL which should be part of the following packet. The
bug was caused by using 0 as a sentinel value in a variable that could
legitimately hold 0. Fix it by switching the sentinel value to -1.

PR:		178055
Reported by:	Richard <rsitze@gmail.com>
Reviewed by:	cem
Differential Revision:	https://reviews.freebsd.org/D16853

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