linux-kernel - [169/262] USB: Avoid NULL pointer deref in usb_hcd_alloc

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Message-Id: <20111109212717.595864553@clark.kroah.org>
Date:	Wed, 09 Nov 2011 13:28:11 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: [169/262] USB: Avoid NULL pointer deref in usb_hcd_alloc_bandwidth.

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sarah Sharp <sarah.a.sharp@...ux.intel.com>

commit 8a9af4fdf6d5eeb3200a088354d266a87e8260b0 upstream.

usb_ifnum_to_if() can return NULL if the USB device does not have a
configuration installed (usb_device->actconfig == NULL), or if we can't
find the interface number in the installed configuration.  Return an
error instead of crashing.

Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1764,6 +1764,8 @@ int usb_hcd_alloc_bandwidth(struct usb_d
 		struct usb_interface *iface = usb_ifnum_to_if(udev,
 				cur_alt->desc.bInterfaceNumber);
 
+		if (!iface)
+			return -EINVAL;
 		if (iface->resetting_device) {
 			/*
 			 * The USB core just reset the device, so the xHCI host


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