wusb: fix find_first_zero_bit() return value check

In wusb_cluster_id_get(), if no zero bits exist in wusb_cluster_id_table,
find_first_zero_bit() returns CLUSTER_IDS.

But it is impossible to detect that the bitmap is full because there
is an off-by-one error in the return value check.  It will cause
unexpected memory access by setting bit out of wusb_cluster_id_table
bitmap, and caller will get wrong cluster id.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: linux-usb@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
index 2054d4e..0faca16 100644 (file)
--- a/drivers/usb/wusbcore/wusbhc.c
+++ b/drivers/usb/wusbcore/wusbhc.c
@@ -320,7 +320,7 @@ u8 wusb_cluster_id_get(void)
        u8 id;
        spin_lock(&wusb_cluster_ids_lock);
        id = find_first_zero_bit(wusb_cluster_id_table, CLUSTER_IDS);
-       if (id > CLUSTER_IDS) {
+       if (id >= CLUSTER_IDS) {
                id = 0;
                goto out;
        }