Patch "usb: config->desc.bLength may not exceed amount of data returned by the device" has been added to the 3.10-stable tree

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

    usb: config->desc.bLength may not exceed amount of data returned by the device

to the 3.10-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:
     usb-config-desc.blength-may-not-exceed-amount-of-data-returned-by-the-device.patch
and it can be found in the queue-3.10 subdirectory.

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


>From b4f17a488ae2e09bfcf95c0e0b4219c246f1116a Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Sat, 3 Aug 2013 16:37:48 +0200
Subject: usb: config->desc.bLength may not exceed amount of data returned by the device

From: Hans de Goede <hdegoede@xxxxxxxxxx>

commit b4f17a488ae2e09bfcf95c0e0b4219c246f1116a upstream.

While reading the config parsing code I noticed this check is missing, without
this check config->desc.wTotalLength can end up with a value larger then the
dev->rawdescriptors length for the config, and when userspace then tries to
get the rawdescriptors bad things may happen.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/core/config.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -424,7 +424,8 @@ static int usb_parse_configuration(struc
 
 	memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
 	if (config->desc.bDescriptorType != USB_DT_CONFIG ||
-	    config->desc.bLength < USB_DT_CONFIG_SIZE) {
+	    config->desc.bLength < USB_DT_CONFIG_SIZE ||
+	    config->desc.bLength > size) {
 		dev_err(ddev, "invalid descriptor for config index %d: "
 		    "type = 0x%X, length = %d\n", cfgidx,
 		    config->desc.bDescriptorType, config->desc.bLength);


Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are

queue-3.10/usb-config-desc.blength-may-not-exceed-amount-of-data-returned-by-the-device.patch
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