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NFC: potential integer overflow problem in check_crc()

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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>
This commit is contained in:
Dan Carpenter 2012-05-18 10:36:47 +03:00 committed by John W. Linville
parent f380f2c4a1
commit 885ba1da68
1 changed files with 1 additions and 1 deletions
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2
drivers/nfc/pn544_hci.c
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@ -232,7 +232,7 @@ static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
static int check_crc(u8 *buf, int buflen)
{
u8 len;
int len;
u16 crc;
len = buf[0] + 1;