linux-kernel - [PATCH 4.9 01/14] nfc: st21nfca: Fix potential buffer overflows in EVT

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Date:   Fri, 25 Mar 2022 16:04:29 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jordy Zomer <jordy@...ing.systems>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        "David S. Miller" <davem@...emloft.net>,
        Denis Efremov <denis.e.efremov@...cle.com>
Subject: [PATCH 4.9 01/14] nfc: st21nfca: Fix potential buffer overflows in EVT_TRANSACTION

From: Jordy Zomer <jordy@...ing.systems>

commit 4fbcc1a4cb20fe26ad0225679c536c80f1648221 upstream.

It appears that there are some buffer overflows in EVT_TRANSACTION.
This happens because the length parameters that are passed to memcpy
come directly from skb->data and are not guarded in any way.

Signed-off-by: Jordy Zomer <jordy@...ing.systems>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Denis Efremov <denis.e.efremov@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nfc/st21nfca/se.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -330,6 +330,11 @@ int st21nfca_connectivity_event_received
 			return -ENOMEM;
 
 		transaction->aid_len = skb->data[1];
+
+		/* Checking if the length of the AID is valid */
+		if (transaction->aid_len > sizeof(transaction->aid))
+			return -EINVAL;
+
 		memcpy(transaction->aid, &skb->data[2],
 		       transaction->aid_len);
 
@@ -339,6 +344,11 @@ int st21nfca_connectivity_event_received
 			return -EPROTO;
 
 		transaction->params_len = skb->data[transaction->aid_len + 3];
+
+		/* Total size is allocated (skb->len - 2) minus fixed array members */
+		if (transaction->params_len > ((skb->len - 2) - sizeof(struct nfc_evt_transaction)))
+			return -EINVAL;
+
 		memcpy(transaction->params, skb->data +
 		       transaction->aid_len + 4, transaction->params_len);