From: Bjørn Mork <bjorn@mork.no>
Date: Mon, 16 Jan 2012 14:11:59 +0000 (+0100)
Subject: USB: cdc-wdm: better allocate a buffer that is at least as big as we tell the USB... 
X-Git-Tag: firefly_0821_release~7541^2~1834
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5256ca41663c848ac24783a5161a97730a21696c;p=firefly-linux-kernel-4.4.55.git

USB: cdc-wdm: better allocate a buffer that is at least as big as we tell the USB core

commit 655e247daf52b202a6c2d0f8a06dd2051e756ce4 upstream.

As it turns out, there was a mismatch between the allocated inbuf size
(desc->bMaxPacketSize0, typically something like 64) and the length we
specified in the URB (desc->wMaxCommand, typically something like 2048)

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index ed4317365fa0..854615ca37ab 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -723,7 +723,7 @@ next_desc:
 		goto err;
 
 	desc->inbuf = usb_alloc_coherent(interface_to_usbdev(intf),
-					 desc->bMaxPacketSize0,
+					 desc->wMaxCommand,
 					 GFP_KERNEL,
 					 &desc->response->transfer_dma);
 	if (!desc->inbuf)