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nfc: nci: Potential off by one in ->pipes[] array

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This is similar to commit e285d5bfb7 ("NFC: Fix the number of pipes")
where we changed NFC_HCI_MAX_PIPES from 127 to 128.

As the comment next to the define explains, the pipe identifier is 7
bits long.  The highest possible pipe is 127, but the number of possible
pipes is 128.  As the code is now, then there is potential for an
out of bounds array access:

    net/nfc/nci/hci.c:297 nci_hci_cmd_received() warn: array off by one?
    'ndev->hci_dev->pipes[pipe]' '0-127 == 127'

Fixes: 11f54f2286 ("NFC: nci: Add HCI over NCI protocol support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2019-04-03 10:13:51 +03:00 committed by David S. Miller
parent d7ee81ad09
commit 6491d69839
1 changed files with 1 additions and 1 deletions
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include/net/nfc/nci_core.h
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@ -166,7 +166,7 @@ struct nci_conn_info {
* According to specification 102 622 chapter 4.4 Pipes,
* the pipe identifier is 7 bits long.
*/
#define NCI_HCI_MAX_PIPES 127
#define NCI_HCI_MAX_PIPES 128
struct nci_hci_gate {
u8 gate;