Patch "staging: vt6656: use off stack for out buffer USB transfers." has been added to the 4.4-stable tree

Patch "staging: vt6656: use off stack for out buffer USB transfers." has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     staging-vt6656-use-off-stack-for-out-buffer-usb-transfers.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 12ecd24ef93277e4e5feaf27b0b18f2d3828bc5e Mon Sep 17 00:00:00 2001
From: Malcolm Priestley <tvboxspy@gmail.com>
Date: Sat, 22 Apr 2017 11:14:57 +0100
Subject: staging: vt6656: use off stack for out buffer USB transfers.

From: Malcolm Priestley <tvboxspy@gmail.com>

commit 12ecd24ef93277e4e5feaf27b0b18f2d3828bc5e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/staging/vt6656/usbpipe.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

--- a/drivers/staging/vt6656/usbpipe.c
+++ b/drivers/staging/vt6656/usbpipe.c
@@ -50,15 +50,25 @@ int vnt_control_out(struct vnt_private *
 		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);
 


Patches currently in stable-queue which might be from tvboxspy@gmail.com are

queue-4.4/staging-vt6656-use-off-stack-for-in-buffer-usb-transfers.patch
queue-4.4/staging-vt6656-use-off-stack-for-out-buffer-usb-transfers.patch