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Subject[PATCH 08/13] USB: kl5kusb105: fix DMA buffers on stack
Date
Cc: Oliver Neukum <oliver@neukum.name>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
---
drivers/usb/serial/kl5kusb105.c | 63 +++++++++++++++++++++++++++-----------
1 files changed, 45 insertions(+), 18 deletions(-)
diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index 3a78738..731964b 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -212,10 +212,19 @@ static int klsi_105_get_line_state(struct usb_serial_port *port,
unsigned long *line_state_p)
{
int rc;
- __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1, -1};
+ u8 *status_buf;
__u16 status;

dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
+
+ status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
+ if (!status_buf) {
+ dev_err(&port->dev, "%s - out of memory for status buffer.\n",
+ __func__);
+ return -ENOMEM;
+ }
+ status_buf[0] = 0xff;
+ status_buf[1] = 0xff;
rc = usb_control_msg(port->serial->dev,
usb_rcvctrlpipe(port->serial->dev, 0),
KL5KUSB105A_SIO_POLL,
@@ -236,6 +245,8 @@ static int klsi_105_get_line_state(struct usb_serial_port *port,

*line_state_p = klsi_105_status2linestate(status);
}
+
+ kfree(status_buf);
return rc;
}

@@ -364,7 +375,7 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
int rc;
int i;
unsigned long line_state;
- struct klsi_105_port_settings cfg;
+ struct klsi_105_port_settings *cfg;
unsigned long flags;

dbg("%s port %d", __func__, port->number);
@@ -376,12 +387,18 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
* Then read the modem line control and store values in
* priv->line_state.
*/
- cfg.pktlen = 5;
- cfg.baudrate = kl5kusb105a_sio_b9600;
- cfg.databits = kl5kusb105a_dtb_8;
- cfg.unknown1 = 0;
- cfg.unknown2 = 1;
- klsi_105_chg_port_settings(port, &cfg);
+ cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ dev_err(&port->dev, "%s - out of memory for config buffer.\n",
+ __func__);
+ return -ENOMEM;
+ }
+ cfg->pktlen = 5;
+ cfg->baudrate = kl5kusb105a_sio_b9600;
+ cfg->databits = kl5kusb105a_dtb_8;
+ cfg->unknown1 = 0;
+ cfg->unknown2 = 1;
+ klsi_105_chg_port_settings(port, cfg);

/* set up termios structure */
spin_lock_irqsave(&priv->lock, flags);
@@ -391,11 +408,11 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
priv->termios.c_lflag = tty->termios->c_lflag;
for (i = 0; i < NCCS; i++)
priv->termios.c_cc[i] = tty->termios->c_cc[i];
- priv->cfg.pktlen = cfg.pktlen;
- priv->cfg.baudrate = cfg.baudrate;
- priv->cfg.databits = cfg.databits;
- priv->cfg.unknown1 = cfg.unknown1;
- priv->cfg.unknown2 = cfg.unknown2;
+ priv->cfg.pktlen = cfg->pktlen;
+ priv->cfg.baudrate = cfg->baudrate;
+ priv->cfg.databits = cfg->databits;
+ priv->cfg.unknown1 = cfg->unknown1;
+ priv->cfg.unknown2 = cfg->unknown2;
spin_unlock_irqrestore(&priv->lock, flags);

/* READ_ON and urb submission */
@@ -441,6 +458,7 @@ static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
retval = rc;

exit:
+ kfree(cfg);
return retval;
} /* klsi_105_open */

@@ -714,10 +732,17 @@ static void klsi_105_set_termios(struct tty_struct *tty,
unsigned int old_iflag = old_termios->c_iflag;
unsigned int cflag = tty->termios->c_cflag;
unsigned int old_cflag = old_termios->c_cflag;
- struct klsi_105_port_settings cfg;
+ struct klsi_105_port_settings *cfg;
unsigned long flags;
speed_t baud;

+ cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
+ if (!cfg) {
+ dev_err(&port->dev, "%s - out of memory for config buffer.\n",
+ __func__);
+ return;
+ }
+
/* lock while we are modifying the settings */
spin_lock_irqsave(&priv->lock, flags);

@@ -793,11 +818,11 @@ static void klsi_105_set_termios(struct tty_struct *tty,
case CS5:
dbg("%s - 5 bits/byte not supported", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
- return ;
+ goto err;
case CS6:
dbg("%s - 6 bits/byte not supported", __func__);
spin_unlock_irqrestore(&priv->lock, flags);
- return ;
+ goto err;
case CS7:
priv->cfg.databits = kl5kusb105a_dtb_7;
break;
@@ -856,11 +881,13 @@ static void klsi_105_set_termios(struct tty_struct *tty,
#endif
;
}
- memcpy(&cfg, &priv->cfg, sizeof(cfg));
+ memcpy(cfg, &priv->cfg, sizeof(*cfg));
spin_unlock_irqrestore(&priv->lock, flags);

/* now commit changes to device */
- klsi_105_chg_port_settings(port, &cfg);
+ klsi_105_chg_port_settings(port, cfg);
+err:
+ kfree(cfg);
} /* klsi_105_set_termios */


--
1.6.6


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