From: Dirk Eibach <eibach@gdsys.de>
Date: Thu, 18 Jun 2009 23:49:15 +0000 (-0700)
Subject: char: moxa, prevent opening unavailable ports
X-Git-Tag: v2.6.27.26~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=72f08ac8548b7cfb1f280340f40cc8ae702612b3;p=pandora-kernel.git

char: moxa, prevent opening unavailable ports

commit a90b037583d5f1ae3e54e9c687c79df82d1d34a4 upstream.

In moxa.c there are 32 minor numbers reserved for each device.  The number
of ports actually available per device is stored in
moxa_board_conf->numPorts.  This number is not considered in moxa_open().
Opening a port that is not available results in a kernel oops.  This patch
adds a test to moxa_open() that prevents opening unavailable ports.

[akpm@linux-foundation.org: avoid multiple returns]
Signed-off-by: Dirk Eibach <eibach@gdsys.de>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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