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

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 ed4317365fa05af5629e9953e5315a2eba1a68d4..854615ca37ab190a0a93670b9b664869ea48d0a6 100644 (file)
--- 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)