| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 243/270] USB: opticon: fix DMA from stack | Date | Mon, 26 Nov 2012 14:58:53 -0200 |
| |
3.5.7u1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <jhovold@gmail.com>
commit ea0dbebffe118724cd4df7d9b071ea8ee48d48f0 upstream.
Make sure to allocate the control-message buffer dynamically as some platforms cannot do DMA from stack.
Note that only the first byte of the old buffer was used.
Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- drivers/usb/serial/opticon.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c index 02cb1b7..5ba2700 100644 --- a/drivers/usb/serial/opticon.c +++ b/drivers/usb/serial/opticon.c @@ -158,7 +158,11 @@ static int send_control_msg(struct usb_serial_port *port, u8 requesttype, { struct usb_serial *serial = port->serial; int retval; - u8 buffer[2]; + u8 *buffer; + + buffer = kzalloc(1, GFP_KERNEL); + if (!buffer) + return -ENOMEM; buffer[0] = val; /* Send the message to the vendor control endpoint @@ -167,6 +171,7 @@ static int send_control_msg(struct usb_serial_port *port, u8 requesttype, requesttype, USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, 0, 0, buffer, 1, 0); + kfree(buffer); return retval; } -- 1.7.9.5
|