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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 <>

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 <>
Signed-off-by: Greg Kroah-Hartman <>

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,

+ if (!iface)
+ return -EINVAL;
if (iface->resetting_device) {
* The USB core just reset the device, so the xHCI host

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