quot: Fix benign buffer overflowstable/13

If it encounters an inode whose owner does not have a pw entry, quot
allocates a 7-byte buffer (8 in practice, since that is the minimum
allocation size) and uses it to store the numeric uid preceded by a
hash character.  This will overflow the allocated buffer if the UID
exceeds 6 decimal digits.  Avoid this by using asprintf() instead.

While here, simplify the common case as well using strdup().

Reported by:	Igor Gabriel Sousa e Souza <igor@bsdtrust.com>
MFC after:	3 days
Reviewed by:	obiwac, emaste
Differential Revision:	https://reviews.freebsd.org/D53129

(cherry picked from commit 5854d1cbab1073d78519e7ad9a6eb5726341d587)

0 files changed, 0 insertions, 0 deletions