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From: Amit Pundir <amit.pundir@linaro.org>
To: lkml <linux-kernel@vger.kernel.org>, linux-wireless@vger.kernel.org
Cc: Samuel Ortiz <sameo@linux.intel.com>,
	Christophe Ricard <christophe.ricard@gmail.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	John Stultz <john.stultz@linaro.org>,
	Dmitry Shmidt <dimitrysh@google.com>,
	Todd Kjos <tkjos@google.com>,
	Android Kernel Team <kernel-team@android.com>,
	Suren Baghdasaryan <surenb@google.com>
Subject: [RESEND][PATCH 3/4] NFC: Fix possible memory corruption when handling SHDLC I-Frame commands
Date: Wed, 18 Apr 2018 15:35:03 +0530	[thread overview]
Message-ID: <1524045904-7005-4-git-send-email-amit.pundir@linaro.org> (raw)
In-Reply-To: <1524045904-7005-1-git-send-email-amit.pundir@linaro.org>

From: Suren Baghdasaryan <surenb@google.com>

When handling SHDLC I-Frame commands "pipe" field used for indexing
into an array should be checked before usage. If left unchecked it
might access memory outside of the array of size NFC_HCI_MAX_PIPES(127).

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
---
 net/nfc/hci/core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
index ac8030c4bcf8..19cb2e473ea6 100644
--- a/net/nfc/hci/core.c
+++ b/net/nfc/hci/core.c
@@ -209,6 +209,11 @@ void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 		}
 		create_info = (struct hci_create_pipe_resp *)skb->data;
 
+		if (create_info->pipe >= NFC_HCI_MAX_PIPES) {
+			status = NFC_HCI_ANY_E_NOK;
+			goto exit;
+		}
+
 		/* Save the new created pipe and bind with local gate,
 		 * the description for skb->data[3] is destination gate id
 		 * but since we received this cmd from host controller, we
@@ -232,6 +237,11 @@ void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
 		}
 		delete_info = (struct hci_delete_pipe_noti *)skb->data;
 
+		if (delete_info->pipe >= NFC_HCI_MAX_PIPES) {
+			status = NFC_HCI_ANY_E_NOK;
+			goto exit;
+		}
+
 		hdev->pipes[delete_info->pipe].gate = NFC_HCI_INVALID_GATE;
 		hdev->pipes[delete_info->pipe].dest_host = NFC_HCI_INVALID_HOST;
 		break;
-- 
2.7.4

  parent reply	other threads:[~2018-04-18 10:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-18 10:05 [RESEND][PATCH 0/4] Few NFC fixes from android-4.14 tree Amit Pundir
2018-04-18 10:05 ` [RESEND][PATCH 1/4] NFC: st21nfca: Fix out of bounds kernel access when handling ATR_REQ Amit Pundir
2018-04-18 10:05 ` [RESEND][PATCH 2/4] NFC: st21nfca: Fix memory OOB and leak issues in connectivity events handler Amit Pundir
2018-04-20 12:39   ` Andy Shevchenko
2018-04-20 16:45     ` Mark Greer
2018-04-23 17:21       ` Amit Pundir
2018-04-23 17:20     ` Amit Pundir
2018-04-18 10:05 ` Amit Pundir [this message]
2018-04-18 10:05 ` [RESEND][PATCH 4/4] NFC: fdp: Fix possible buffer overflow in WCS4000 NFC driver Amit Pundir
2018-04-20 12:41   ` Andy Shevchenko
2018-04-23  9:16   ` Greg KH
2018-04-23 10:02     ` Amit Pundir

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