Re: kern/53546: ifconfig tapXXXXX problem (wrong unit name or panic)

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/53546; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/53546: ifconfig tapXXXXX problem (wrong unit name or panic)
Date: Fri, 24 Aug 2018 09:00:29 -0000 (UTC)

 msaitoh%execsw.org@localhost writes:
 
 >	ifconfig tap65537 create
 >	[ 1491.1341302] tap1: Ethernet address f2:0b:a4:1c:e7:17
 >	(not 65537 but 1)
 
 tap is not only an interface but also a character device and both share the
 same unit number. Device unit numbers are of type 'short'.
 
 >	ifconfig tap99999 create
 
 that translates to a negative device unit number that isn't validated.
 
 Checking the unit number for positive short values in tap_clone_creator()
 should fix both problems.
 
 -- 
 -- 
                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."