linux-kernel - [PATCH] cdc-wdm endianness fixes

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Message-Id: <E1K36og-0007Yz-Hn@ZenIV.linux.org.uk>
Date:	Mon, 02 Jun 2008 10:59:02 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	torvalds@...ux-foundation.org
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org
Subject: [PATCH] cdc-wdm endianness fixes


* wMaxPacketSize is le16; copying it to a field of local structure and then
  using that field as host-endian (size of object to be allocated) is broken.
* bMaxPacketSize0 is 8-bit; feeding it to le16_to_cpu() is bogus and since the
  result is used as host-endian, it's not even misspelled cpu_to_le16().

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 107666d..731db05 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -611,8 +611,8 @@ next_desc:
 		goto err;
 	}
 
-	desc->wMaxPacketSize = ep->wMaxPacketSize;
-	desc->bMaxPacketSize0 = cpu_to_le16(udev->descriptor.bMaxPacketSize0);
+	desc->wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize);
+	desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
 
 	desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
 	if (!desc->orq)
--
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