linux-kernel - [PATCH 1/1] NFC: Fix the number of pipes

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Message-Id: <20180814223519.13610-1-surenb@google.com>
Date:   Tue, 14 Aug 2018 15:35:19 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     security@...nel.org, dan.carpenter@...cle.com, kdeus@...gle.com,
        surenb@...gle.com, Samuel Ortiz <sameo@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] NFC: Fix the number of pipes

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.

Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
---
 include/net/nfc/hci.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/nfc/hci.h b/include/net/nfc/hci.h
index 316694dafa5b..008f466d1da7 100644
--- 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];
-- 
2.18.0.865.gffc8e1a3cd6-goog