Changing the port close-delay parameter is a privileged operation so
make sure to return -EPERM if a regular user tries to change it.
Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver")
Cc: stable@xxxxxxxxxxxxxxx # 3.8
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/staging/fwserial/fwserial.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c
index c963848522b1..440d11423812 100644
--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -1232,20 +1232,24 @@ static int set_serial_info(struct tty_struct *tty,
struct serial_struct *ss)
{
struct fwtty_port *port = tty->driver_data;
+ unsigned int cdelay;
if (ss->irq != 0 || ss->port != 0 || ss->custom_divisor != 0 ||
ss->baud_base != 400000000)
return -EPERM;
+ cdelay = msecs_to_jiffies(ss->close_delay * 10);
+
mutex_lock(&port->port.mutex);
if (!capable(CAP_SYS_ADMIN)) {
- if (((ss->flags & ~ASYNC_USR_MASK) !=
+ if (cdelay != port->port.close_delay ||
+ ((ss->flags & ~ASYNC_USR_MASK) !=
(port->port.flags & ~ASYNC_USR_MASK))) {
mutex_unlock(&port->port.mutex);
return -EPERM;
}
}
- port->port.close_delay = msecs_to_jiffies(ss->close_delay * 10);
+ port->port.close_delay = cdelay;
mutex_unlock(&port->port.mutex);
return 0;
--
2.26.3
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