Merge tag 'usb-4.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are some USB fixes for 4.15-rc4.

  There is the usual handful gadget/dwc2/dwc3 fixes as always, for
  reported issues. But the most important things in here is the core fix
  from Alan Stern to resolve a nasty security bug (my first attempt is
  reverted, Alan's was much cleaner), as well as a number of usbip fixes
  from Shuah Khan to resolve those reported security issues.

  All of these have been in linux-next with no reported issues"

* tag 'usb-4.15-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  USB: core: prevent malicious bNumInterfaces overflow
  Revert "USB: core: only clean up what we allocated"
  USB: core: only clean up what we allocated
  Revert "usb: gadget: allow to enable legacy drivers without USB_ETH"
  usb: gadget: webcam: fix V4L2 Kconfig dependency
  usb: dwc2: Fix TxFIFOn sizes and total TxFIFO size issues
  usb: dwc3: gadget: Fix PCM1 for ISOC EP with ep->mult less than 3
  usb: dwc3: of-simple: set dev_pm_ops
  usb: dwc3: of-simple: fix missing clk_disable_unprepare
  usb: dwc3: gadget: Wait longer for controller to end command processing
  usb: xhci: fix TDS for MTK xHCI1.1
  xhci: Don't add a virt_dev to the devs array before it's fully allocated
  usbip: fix stub_send_ret_submit() vulnerability to null transfer_buffer
  usbip: prevent vhci_hcd driver from leaking a socket pointer address
  usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input
  usbip: fix stub_rx: get_pipe() to validate endpoint number
  tools/usbip: fixes potential (minor) "buffer overflow" (detected on recent gcc with -Werror)
  USB: uas and storage: Add US_FL_BROKEN_FUA for another JMicron JMS567 ID
  usb: musb: da8xx: fix babble condition handling

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 55b198ba629b..78e92d29f8d9 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -555,6 +555,9 @@ static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
         unsigned iad_num = 0;
 
         memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE);
+        nintf = nintf_orig = config->desc.bNumInterfaces;
+        config->desc.bNumInterfaces = 0;        // Adjusted later
+
         if (config->desc.bDescriptorType != USB_DT_CONFIG ||
             config->desc.bLength < USB_DT_CONFIG_SIZE ||
             config->desc.bLength > size) {
@@ -568,7 +571,6 @@ static int usb_parse_configuration(struct usb_device *dev, int cfgidx,
         buffer += config->desc.bLength;
         size -= config->desc.bLength;
 
-        nintf = nintf_orig = config->desc.bNumInterfaces;
         if (nintf > USB_MAXINTERFACES) {
                 dev_warn(ddev, "config %d has too many interfaces: %d, "
                     "using maximum allowed: %d\n",