linux-kernel - [PATCH] NFC: nci: Add bounds checking in nci_hci_create

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Message-ID: <bcf5453b-7204-4297-9c20-4d8c7dacf586@stanley.mountain>
Date: Fri, 17 Jan 2025 12:38:41 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Christophe Ricard <christophe.ricard@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] NFC: nci: Add bounds checking in nci_hci_create_pipe()

The "pipe" variable is a u8 which comes from the network.  If it's more
than 127, then it results in memory corruption in the caller,
nci_hci_connect_gate().

Cc: stable@...r.kernel.org
Fixes: a1b0b9415817 ("NFC: nci: Create pipe on specific gate in nci_hci_connect_gate")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 net/nfc/nci/hci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/nfc/nci/hci.c b/net/nfc/nci/hci.c
index de175318a3a0..082ab66f120b 100644
--- a/net/nfc/nci/hci.c
+++ b/net/nfc/nci/hci.c
@@ -542,6 +542,8 @@ static u8 nci_hci_create_pipe(struct nci_dev *ndev, u8 dest_host,
 
 	pr_debug("pipe created=%d\n", pipe);
 
+	if (pipe >= NCI_HCI_MAX_PIPES)
+		pipe = NCI_HCI_INVALID_PIPE;
 	return pipe;
 }
 
-- 
2.45.2