From 2d722d28a3614fcd7959adc6e7debf9959b4bb8c Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sun, 19 May 2013 21:52:20 +0300 Subject: USB: cxacru: potential underflow in cxacru_cm_get_array() commit 2a0ebf80aa95cc758d4725f74a7016e992606a39 upstream. The value of "offd" comes off the instance->rcv_buf[] and we used it as the offset into an array. The problem is that we check the upper bound but not for negative values. Signed-off-by: Dan Carpenter Signed-off-by: Greg Kroah-Hartman --- drivers/usb/atm/cxacru.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/usb/atm/cxacru.c') diff --git a/drivers/usb/atm/cxacru.c b/drivers/usb/atm/cxacru.c index a845f8b..9497171 100644 --- a/drivers/usb/atm/cxacru.c +++ b/drivers/usb/atm/cxacru.c @@ -686,7 +686,8 @@ static int cxacru_cm_get_array(struct cxacru_data *instance, enum cxacru_cm_requ { int ret, len; __le32 *buf; - int offb, offd; + int offb; + unsigned int offd; const int stride = CMD_PACKET_SIZE / (4 * 2) - 1; int buflen = ((size - 1) / stride + 1 + size * 2) * 4; -- cgit v1.1