netdev - [PATCH v2 1/3] nfc: st21nfca: fix incorrect validating logic in EVT

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Message-Id: <20220401180955.2025877-1-mfaltesek@google.com>
Date:   Fri,  1 Apr 2022 13:09:55 -0500
From:   Martin Faltesek <mfaltesek@...omium.org>
To:     netdev@...r.kernel.org, kuba@...nel.org, krzk@...nel.org,
        christophe.ricard@...il.com, jordy@...ing.systems
Cc:     sameo@...ux.intel.com, wklin@...gle.com, groeck@...gle.com,
        mfaltesek@...gle.com, gregkh@...uxfoundation.org
Subject: [PATCH v2 1/3] nfc: st21nfca: fix incorrect validating logic in EVT_TRANSACTION

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")
Signed-off-by: Martin Faltesek <mfaltesek@...gle.com>
---
 drivers/nfc/st21nfca/se.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c
index c922f10d0d7b..9a37de60f73f 100644
--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -307,7 +307,7 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
 		 * 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;
 
-- 
2.35.1.1094.g7c7d902a7c-goog