Commit 8a9af4fd authored Aug 09, 2011 by Sarah Sharp

USB: Avoid NULL pointer deref in usb_hcd_alloc_bandwidth.



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@linux.intel.com>

parent 585df1d9

drivers/usb/core/hcd.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1775,6 +1775,8 @@ int usb_hcd_alloc_bandwidth(struct usb_device *udev,
		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