K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2020-04-26T16:16:39.815902Z
K 7
svn:log
V 401
pf: Improve input validation

If we pass an anchor name which doesn't exist pfr_table_count() returns
-1, which leads to an overflow in mallocarray() and thus a panic.

Explicitly check that pfr_table_count() does not return an error.

Reported-by:	syzbot+bd09d55d897d63d5f4f4@syzkaller.appspotmail.com
Reviewed by:	melifaro
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D24539

END