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Date: Thu, 25 Oct 2012 17:05:51 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
alan@...rguk.ukuu.org.uk, Johan Hovold <jhovold@...il.com>
Subject: [ 33/85] USB: pl2303: fix port-data memory leak
3.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <jhovold@...il.com>
commit 8bf769eb5f6efc33f95088850f33fcc05d28b508 upstream.
Fix port-data memory leak by allocating and freeing port data in
port_probe/remove rather than in attach/release, and by introducing
serial private data to store the device type which is interface rather
than port specific.
Since commit 0998d0631001288 (device-core: Ensure drvdata = NULL when no
driver is bound) the port private data is no longer freed at release.
Signed-off-by: Johan Hovold <jhovold@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/usb/serial/pl2303.c | 90 ++++++++++++++++++++++++++------------------
1 file changed, 54 insertions(+), 36 deletions(-)
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -135,12 +135,15 @@ enum pl2303_type {
HX, /* HX version of the pl2303 chip */
};
+struct pl2303_serial_private {
+ enum pl2303_type type;
+};
+
struct pl2303_private {
spinlock_t lock;
wait_queue_head_t delta_msr_wait;
u8 line_control;
u8 line_status;
- enum pl2303_type type;
};
static int pl2303_vendor_read(__u16 value, __u16 index,
@@ -169,14 +172,19 @@ static int pl2303_vendor_write(__u16 val
static int pl2303_startup(struct usb_serial *serial)
{
- struct pl2303_private *priv;
+ struct pl2303_serial_private *spriv;
enum pl2303_type type = type_0;
unsigned char *buf;
- int i;
+
+ spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
+ if (!spriv)
+ return -ENOMEM;
buf = kmalloc(10, GFP_KERNEL);
- if (buf == NULL)
+ if (!buf) {
+ kfree(spriv);
return -ENOMEM;
+ }
if (serial->dev->descriptor.bDeviceClass == 0x02)
type = type_0;
@@ -188,15 +196,8 @@ static int pl2303_startup(struct usb_ser
type = type_1;
dev_dbg(&serial->interface->dev, "device type: %d\n", type);
- for (i = 0; i < serial->num_ports; ++i) {
- priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
- if (!priv)
- goto cleanup;
- spin_lock_init(&priv->lock);
- init_waitqueue_head(&priv->delta_msr_wait);
- priv->type = type;
- usb_set_serial_port_data(serial->port[i], priv);
- }
+ spriv->type = type;
+ usb_set_serial_data(serial, spriv);
pl2303_vendor_read(0x8484, 0, serial, buf);
pl2303_vendor_write(0x0404, 0, serial);
@@ -215,15 +216,40 @@ static int pl2303_startup(struct usb_ser
kfree(buf);
return 0;
+}
-cleanup:
- kfree(buf);
- for (--i; i >= 0; --i) {
- priv = usb_get_serial_port_data(serial->port[i]);
- kfree(priv);
- usb_set_serial_port_data(serial->port[i], NULL);
- }
- return -ENOMEM;
+static void pl2303_release(struct usb_serial *serial)
+{
+ struct pl2303_serial_private *spriv;
+
+ spriv = usb_get_serial_data(serial);
+ kfree(spriv);
+}
+
+static int pl2303_port_probe(struct usb_serial_port *port)
+{
+ struct pl2303_private *priv;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->lock);
+ init_waitqueue_head(&priv->delta_msr_wait);
+
+ usb_set_serial_port_data(port, priv);
+
+ return 0;
+}
+
+static int pl2303_port_remove(struct usb_serial_port *port)
+{
+ struct pl2303_private *priv;
+
+ priv = usb_get_serial_port_data(port);
+ kfree(priv);
+
+ return 0;
}
static int set_control_lines(struct usb_device *dev, u8 value)
@@ -242,6 +268,7 @@ static void pl2303_set_termios(struct tt
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct usb_serial *serial = port->serial;
+ struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int cflag;
@@ -325,7 +352,7 @@ static void pl2303_set_termios(struct tt
}
if (baud > 1228800) {
/* type_0, type_1 only support up to 1228800 baud */
- if (priv->type != HX)
+ if (spriv->type != HX)
baud = 1228800;
else if (baud > 6000000)
baud = 6000000;
@@ -428,7 +455,7 @@ static void pl2303_set_termios(struct tt
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
if (cflag & CRTSCTS) {
- if (priv->type == HX)
+ if (spriv->type == HX)
pl2303_vendor_write(0x0, 0x61, serial);
else
pl2303_vendor_write(0x0, 0x41, serial);
@@ -470,10 +497,10 @@ static int pl2303_open(struct tty_struct
{
struct ktermios tmp_termios;
struct usb_serial *serial = port->serial;
- struct pl2303_private *priv = usb_get_serial_port_data(port);
+ struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
int result;
- if (priv->type != HX) {
+ if (spriv->type != HX) {
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
} else {
@@ -657,17 +684,6 @@ static void pl2303_break_ctl(struct tty_
dev_err(&port->dev, "error sending break = %d\n", result);
}
-static void pl2303_release(struct usb_serial *serial)
-{
- int i;
- struct pl2303_private *priv;
-
- for (i = 0; i < serial->num_ports; ++i) {
- priv = usb_get_serial_port_data(serial->port[i]);
- kfree(priv);
- }
-}
-
static void pl2303_update_line_status(struct usb_serial_port *port,
unsigned char *data,
unsigned int actual_length)
@@ -829,6 +845,8 @@ static struct usb_serial_driver pl2303_d
.read_int_callback = pl2303_read_int_callback,
.attach = pl2303_startup,
.release = pl2303_release,
+ .port_probe = pl2303_port_probe,
+ .port_remove = pl2303_port_remove,
};
static struct usb_serial_driver * const serial_drivers[] = {
--
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