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USB: mos7720: fix DMA to stack 

The read_mos_reg function is called with stack-allocated buffers, which
must not be used for control messages.

Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-05-27 14:44:39 +02:00 committed by Greg Kroah-Hartman
parent 420021a395
commit 72ea18a558
1 changed files with 14 additions and 3 deletions
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17
drivers/usb/serial/mos7720.c
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@ -227,11 +227,22 @@ static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
__u8 requesttype = (__u8)0xc0;
__u16 index = get_reg_index(reg);
__u16 value = get_reg_value(reg, serial_portnum);
int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
index, data, 1, MOS_WDR_TIMEOUT);
if (status < 0)
u8 *buf;
int status;
buf = kmalloc(1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
status = usb_control_msg(usbdev, pipe, request, requesttype, value,
index, buf, 1, MOS_WDR_TIMEOUT);
if (status == 1)
*data = *buf;
else if (status < 0)
dev_err(&usbdev->dev,
"mos7720: usb_control_msg() failed: %d", status);
kfree(buf);
return status;
}