From: Akinobu Mita <akinobu.mita@xxxxxxxxx>
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@xxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/wusbcore/wusbhc.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/wusbcore/wusbhc.c b/drivers/usb/wusbcore/wusbhc.c
index 2054d4e..0faca16 100644
--- 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;
}
--
1.7.4.1
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