[PATCH 243/270] USB: opticon: fix DMA from stack
From: Herton Ronaldo Krzesinski
Date: Mon Nov 26 2012 - 12:23:53 EST
3.5.7u1 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <jhovold@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@xxxxxxxxxxxxx>
---
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
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