USB: wusb: check CHID is all zeros before stopping the host

An incorrect sizeof() resulted in only 4 (or 8) octets of the CHID being
checked instead of all 16 octets.  A randomly generated CHID had a
probability of being unable to start a WUSB host of less than 1 in
2 billion.

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/wusbcore/mmc.c b/drivers/usb/wusbcore/mmc.c
index 3b52161..2d82739 100644 (file)
--- a/drivers/usb/wusbcore/mmc.c
+++ b/drivers/usb/wusbcore/mmc.c
@@ -263,7 +263,7 @@ int wusbhc_chid_set(struct wusbhc *wusbhc, const struct wusb_ckhdid *chid)
 {
        int result = 0;
 
-       if (memcmp(chid, &wusb_ckhdid_zero, sizeof(chid)) == 0)
+       if (memcmp(chid, &wusb_ckhdid_zero, sizeof(*chid)) == 0)
                chid = NULL;
 
        mutex_lock(&wusbhc->mutex);