linux-kernel - [PATCH 4.19 279/287] nfc: st21nfca: fix incorrect validating logic in EVT

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Message-Id: <20220613094932.455811228@linuxfoundation.org>
Date:   Mon, 13 Jun 2022 12:11:43 +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, Martin Faltesek <mfaltesek@...gle.com>,
        Guenter Roeck <groeck@...omium.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 4.19 279/287] nfc: st21nfca: fix incorrect validating logic in EVT_TRANSACTION

From: Martin Faltesek <mfaltesek@...gle.com>

commit 77e5fe8f176a525523ae091d6fd0fbb8834c156d upstream.

The first validation check for EVT_TRANSACTION has two different checks
tied together with logical AND. One is a check for minimum packet length,
and the other is for a valid aid_tag. If either condition is true (fails),
then an error should be triggered.  The fix is to change && to ||.

Fixes: 26fc6c7f02cb ("NFC: st21nfca: Add HCI transaction event support")
Cc: stable@...r.kernel.org
Signed-off-by: Martin Faltesek <mfaltesek@...gle.com>
Reviewed-by: Guenter Roeck <groeck@...omium.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nfc/st21nfca/se.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -330,7 +330,7 @@ int st21nfca_connectivity_event_received
 		 * AID		81	5 to 16
 		 * PARAMETERS	82	0 to 255
 		 */
-		if (skb->len < NFC_MIN_AID_LENGTH + 2 &&
+		if (skb->len < NFC_MIN_AID_LENGTH + 2 ||
 		    skb->data[0] != NFC_EVT_TRANSACTION_AID_TAG)
 			return -EPROTO;