usb: gadget: composite: Fix use-after-free in usb_composite_overwrite_options

commit aec17e1e249567e82b26dafbb86de7d07fde8729 upstream.

KASAN enabled configuration reports an error

    BUG: KASAN: use-after-free in usb_composite_overwrite_options+...
                [libcomposite] at addr ...
    Read of size 1 by task ...

when some driver is un-bound and then bound again.
For example, this happens with FunctionFS driver when "ffs-test"
test application is run several times in a row.

If the driver has empty manufacturer ID string in initial static data,
it is then replaced with generated string. After driver unbinding
the generated string is freed, but the driver data still keep that
pointer. And if the driver is then bound again, that pointer
is re-used for string emptiness check.

The fix is to clean up the driver string data upon its unbinding
to drop the pointer to freed memory.

Fixes: cc2683c318a5 ("usb: gadget: Provide a default implementation of default manufacturer string")
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index e2641d4dfdd6a928d6ee70559311aaf4fefe04f1..d186d0282a386b951bffe4cbce062d911a6d9be5 100644 (file)
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1905,6 +1905,8 @@ static DEVICE_ATTR_RO(suspended);
 static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
 {
        struct usb_composite_dev        *cdev = get_gadget_data(gadget);
+       struct usb_gadget_strings       *gstr = cdev->driver->strings[0];
+       struct usb_string               *dev_str = gstr->strings;
 
        /* composite_disconnect() must already have been called
         * by the underlying peripheral controller driver!
@@ -1924,6 +1926,9 @@ static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver)
 
        composite_dev_cleanup(cdev);
 
+       if (dev_str[USB_GADGET_MANUFACTURER_IDX].s == cdev->def_manufacturer)
+               dev_str[USB_GADGET_MANUFACTURER_IDX].s = "";
+
        kfree(cdev->def_manufacturer);
        kfree(cdev);
        set_gadget_data(gadget, NULL);