NFC: potential integer overflow problem in check_crc()
If "buf[0]" is 255 then "len" gets set to 0. The call to
"crc_ccitt(0xffff, buf, len - 2);" casts the "len - 2" to a high
positive number which is ugly.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/nfc/pn544_hci.c b/drivers/nfc/pn544_hci.c
index 46f4a9f..281f18c 100644
--- a/drivers/nfc/pn544_hci.c
+++ b/drivers/nfc/pn544_hci.c
@@ -232,7 +232,7 @@
static int check_crc(u8 *buf, int buflen)
{
- u8 len;
+ int len;
u16 crc;
len = buf[0] + 1;