K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2020-11-26T23:34:02.416966Z
K 7
svn:log
V 478
MFC r365910:

fix integer underflow in getgrnam_r and getpwnam_r

Sometimes nscd(8) will return a 1-byte buffer for a nonexistent entry. This
triggered an integer underflow in grp_unmarshal_func, causing getgrnam_r to
return ERANGE instead of 0.

Fix the user's buffer size check, and add a correct check for a too-small
nscd buffer.

PR:		248932
Event:		September 2020 Bugathon
Reviewed by:	markj
Sponsored by:	Axcient
Differential Revision: https://reviews.freebsd.org/D26204

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