linux-kernel - [PATCH 4.4 02/28] NFC: Fix the number of pipes

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Date:   Thu, 27 Sep 2018 11:06:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
        Allen Pais <allen.pais@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH 4.4 02/28] NFC: Fix the number of pipes

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Suren Baghdasaryan <surenb@...gle.com>

commit e285d5bfb7e9785d289663baef252dd315e171f8 upstream.

According to ETSI TS 102 622 specification chapter 4.4 pipe identifier
is 7 bits long which allows for 128 unique pipe IDs. Because
NFC_HCI_MAX_PIPES is used as the number of pipes supported and not
as the max pipe ID, its value should be 128 instead of 127.

nfc_hci_recv_from_llc extracts pipe ID from packet header using
NFC_HCI_FRAGMENT(0x7F) mask which allows for pipe ID value of 127.
Same happens when NCI_HCP_MSG_GET_PIPE() is being used. With
pipes array having only 127 elements and pipe ID of 127 the OOB memory
access will result.

Cc: Samuel Ortiz <sameo@...ux.intel.com>
Cc: Allen Pais <allen.pais@...cle.com>
Cc: "David S. Miller" <davem@...emloft.net>
Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Cc: stable <stable@...r.kernel.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 include/net/nfc/hci.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/nfc/hci.h
+++ b/include/net/nfc/hci.h
@@ -87,7 +87,7 @@ struct nfc_hci_pipe {
  * According to specification 102 622 chapter 4.4 Pipes,
  * the pipe identifier is 7 bits long.
  */
-#define NFC_HCI_MAX_PIPES		127
+#define NFC_HCI_MAX_PIPES		128
 struct nfc_hci_init_data {
 	u8 gate_count;
 	struct nfc_hci_gate gates[NFC_HCI_MAX_CUSTOM_GATES];