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-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=cafbe85fb0d00d32988905c4978df433ca9b6512;p=linux-beck.git

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

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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 9734863a3a49..846dfa603447 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -696,7 +696,7 @@ 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)