queue-5.0/nfc-nci-potential-off-by-one-in-pipes-array.patch

   1 From foo@baz Sat Apr 20 16:43:09 CEST 2019
   2 From: Dan Carpenter <dan.carpenter@oracle.com>
   3 Date: Wed, 3 Apr 2019 10:13:51 +0300
   4 Subject: nfc: nci: Potential off by one in ->pipes[] array
   5
   6 From: Dan Carpenter <dan.carpenter@oracle.com>
   7
   8 [ Upstream commit 6491d698396fd5da4941980a35ca7c162a672016 ]
   9
  10 This is similar to commit e285d5bfb7e9 ("NFC: Fix the number of pipes")
  11 where we changed NFC_HCI_MAX_PIPES from 127 to 128.
  12
  13 As the comment next to the define explains, the pipe identifier is 7
  14 bits long.  The highest possible pipe is 127, but the number of possible
  15 pipes is 128.  As the code is now, then there is potential for an
  16 out of bounds array access:
  17
  18     net/nfc/nci/hci.c:297 nci_hci_cmd_received() warn: array off by one?
  19     'ndev->hci_dev->pipes[pipe]' '0-127 == 127'
  20
  21 Fixes: 11f54f228643 ("NFC: nci: Add HCI over NCI protocol support")
  22 Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
  23 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  24 ---
  25  include/net/nfc/nci_core.h |    2 +-
  26  1 file changed, 1 insertion(+), 1 deletion(-)
  27
  28 --- a/include/net/nfc/nci_core.h
  29 +++ b/include/net/nfc/nci_core.h
  30 @@ -166,7 +166,7 @@ struct nci_conn_info {
  31   * According to specification 102 622 chapter 4.4 Pipes,
  32   * the pipe identifier is 7 bits long.
  33   */
  34 -#define NCI_HCI_MAX_PIPES          127
  35 +#define NCI_HCI_MAX_PIPES          128
  36
  37  struct nci_hci_gate {
  38         u8 gate;