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USB: quatech2: fix serial DMA-buffer allocations 

Make sure serial DMA-buffers are allocated separately from containing
structure to prevent potential memory corruption on non-cache-coherent
systems.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-08-13 13:27:38 +02:00 committed by Greg Kroah-Hartman
parent bad41a5bf1
commit 0448067150
1 changed files with 12 additions and 2 deletions
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14
drivers/usb/serial/quatech2.c
View File

@ -62,6 +62,7 @@
#define MAX_BAUD_RATE 921600
#define DEFAULT_BAUD_RATE 9600
#define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */
#define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */
#define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */
@ -112,7 +113,7 @@ struct qt2_serial_private {
unsigned char current_port; /* current port for incoming data */
struct urb *read_urb; /* shared among all ports */
char read_buffer[512];
char *read_buffer;
};
struct qt2_port_private {
@ -142,6 +143,7 @@ static void qt2_release(struct usb_serial *serial)
serial_priv = usb_get_serial_data(serial);
usb_free_urb(serial_priv->read_urb);
kfree(serial_priv->read_buffer);
kfree(serial_priv);
}
@ -683,7 +685,7 @@ static int qt2_setup_urbs(struct usb_serial *serial)
usb_rcvbulkpipe(serial->dev,
port0->bulk_in_endpointAddress),
serial_priv->read_buffer,
sizeof(serial_priv->read_buffer),
QT2_READ_BUFFER_SIZE,
qt2_read_bulk_callback, serial);
status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
@ -718,6 +720,12 @@ static int qt2_attach(struct usb_serial *serial)
return -ENOMEM;
}
serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
if (!serial_priv->read_buffer) {
status = -ENOMEM;
goto err_buf;
}
usb_set_serial_data(serial, serial_priv);
status = qt2_setup_urbs(serial);
@ -727,6 +735,8 @@ static int qt2_attach(struct usb_serial *serial)
return 0;
attach_failed:
kfree(serial_priv->read_buffer);
err_buf:
kfree(serial_priv);
return status;
}