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staging: vt6656: use off stack for out buffer USB transfers. 

Since 4.9 mandated USB buffers be heap allocated this causes the driver
to fail.

Since there is a wide range of buffer sizes use kmemdup to create
allocated buffer.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Malcolm Priestley 2017-04-22 11:14:57 +01:00 committed by Greg Kroah-Hartman
parent 00916cfc61
commit 12ecd24ef9
1 changed files with 12 additions and 2 deletions
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14
drivers/staging/vt6656/usbpipe.c
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@ -47,15 +47,25 @@ int vnt_control_out(struct vnt_private *priv, u8 request, u16 value,
u16 index, u16 length, u8 *buffer)
{
int status = 0;
u8 *usb_buffer;
if (test_bit(DEVICE_FLAGS_DISCONNECTED, &priv->flags))
return STATUS_FAILURE;
mutex_lock(&priv->usb_lock);
usb_buffer = kmemdup(buffer, length, GFP_KERNEL);
if (!usb_buffer) {
mutex_unlock(&priv->usb_lock);
return -ENOMEM;
}
status = usb_control_msg(priv->usb,
usb_sndctrlpipe(priv->usb, 0), request, 0x40, value,
index, buffer, length, USB_CTL_WAIT);
usb_sndctrlpipe(priv->usb, 0),
request, 0x40, value,
index, usb_buffer, length, USB_CTL_WAIT);
kfree(usb_buffer);
mutex_unlock(&priv->usb_lock);