From 12ecd24ef93277e4e5feaf27b0b18f2d3828bc5e Mon Sep 17 00:00:00 2001 From: Malcolm Priestley Date: Sat, 22 Apr 2017 11:14:57 +0100 Subject: [PATCH] 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 Cc: # v4.9+ Signed-off-by: Greg Kroah-Hartman --- drivers/staging/vt6656/usbpipe.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/staging/vt6656/usbpipe.c b/drivers/staging/vt6656/usbpipe.c index 9ad8503d2589..ea5a7c65ad1b 100644 --- a/drivers/staging/vt6656/usbpipe.c +++ b/drivers/staging/vt6656/usbpipe.c @@ -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); -- 2.20.1