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authorDirk Eibach <eibach@gdsys.de>2009-06-11 14:56:44 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-11 08:51:09 -0700
commitf0e8527726b9e56649b9eafde3bc0fbc4dd2dd47 (patch)
treeb2f13d50f6ac8f22d849100d507abec22d63be1c /drivers/char/moxa.c
parentd7f8d437bda0ec409e26cffb846bc28a40603ee3 (diff)
downloadop-kernel-dev-f0e8527726b9e56649b9eafde3bc0fbc4dd2dd47.zip
op-kernel-dev-f0e8527726b9e56649b9eafde3bc0fbc4dd2dd47.tar.gz
moxa: prevent opening unavailable ports
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. Signed-off-by: Dirk Eibach <eibach@gdsys.de> Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/moxa.c')
-rw-r--r--drivers/char/moxa.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index 4a4cab7..65b6ff2 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -1184,6 +1184,11 @@ static int moxa_open(struct tty_struct *tty, struct file *filp)
return -ENODEV;
}
+ if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
+ mutex_unlock(&moxa_openlock);
+ return -ENODEV;
+ }
+
ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
ch->port.count++;
tty->driver_data = ch;
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