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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>
This commit is contained in:
Sarah Sharp 2011-08-09 16:31:54 -07:00
parent 585df1d90c
commit 8a9af4fdf6
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/core/hcd.c
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@ -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