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| author | Dirk Eibach <eibach@gdsys.de> | 2009-06-11 14:56:44 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-11 08:51:09 -0700 |
| commit | f0e8527726b9e56649b9eafde3bc0fbc4dd2dd47 (patch) | |
| tree | b2f13d50f6ac8f22d849100d507abec22d63be1c /drivers/char | |
| parent | d7f8d437bda0ec409e26cffb846bc28a40603ee3 (diff) | |
| download | lwn-f0e8527726b9e56649b9eafde3bc0fbc4dd2dd47.tar.gz lwn-f0e8527726b9e56649b9eafde3bc0fbc4dd2dd47.zip | |
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')
| -rw-r--r-- | drivers/char/moxa.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index 4a4cab73d0be..65b6ff2442c6 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; |