USB: core: prevent malicious bNumInterfaces overflow

A malicious USB device with crafted descriptors can cause the kernel
to access unallocated memory by setting the bNumInterfaces value too
high in a configuration descriptor.  Although the value is adjusted
during parsing, this adjustment is skipped in one of the error return
paths.

This patch prevents the problem by setting bNumInterfaces to 0
initially.  The existing code already sets it to the proper value
after parsing is complete.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name usb-core-prevent-malicious-bnuminterfaces-overflow.patch

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 5008f71fb08d3b132445b72764b93d61059abf54..57a8986edfe91bbc8d5150b1b1c805494c9364ce 100644 (file)
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -550,6 +550,9 @@ 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) {
@@ -563,7 +566,6 @@ 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",