netdev - [PATCH net v3 2/3] nfc: st21nfca: fix memory leaks in EVT

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Message-Id: <20220607025729.1673212-3-mfaltesek@google.com>
Date:   Mon,  6 Jun 2022 21:57:28 -0500
From:   Martin Faltesek <mfaltesek@...gle.com>
To:     kuba@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     christophe.ricard@...il.com, gregkh@...uxfoundation.org,
        groeck@...gle.com, jordy@...ing.systems, krzk@...nel.org,
        mfaltesek@...gle.com, martin.faltesek@...il.com,
        netdev@...r.kernel.org, linux-nfc@...ts.01.org,
        sameo@...ux.intel.com, wklin@...gle.com, theflamefire89@...il.com,
        stable@...r.kernel.org
Subject: [PATCH net v3 2/3] nfc: st21nfca: fix memory leaks in EVT_TRANSACTION handling

Error paths do not free previously allocated memory. Add devm_kfree() to
those failure paths.

Fixes: 26fc6c7f02cb ("NFC: st21nfca: Add HCI transaction event support")
Fixes: 4fbcc1a4cb20 ("nfc: st21nfca: Fix potential buffer overflows in EVT_TRANSACTION")
Cc: stable@...r.kernel.org
Signed-off-by: Martin Faltesek <mfaltesek@...gle.com>
---
 drivers/nfc/st21nfca/se.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c
index 9645777f2544..8e1113ce139b 100644
--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -326,22 +326,29 @@ int st21nfca_connectivity_event_received(struct nfc_hci_dev *hdev, u8 host,
 		transaction->aid_len = skb->data[1];
 
 		/* Checking if the length of the AID is valid */
-		if (transaction->aid_len > sizeof(transaction->aid))
+		if (transaction->aid_len > sizeof(transaction->aid)) {
+			devm_kfree(dev, transaction);
 			return -EINVAL;
+		}
 
 		memcpy(transaction->aid, &skb->data[2],
 		       transaction->aid_len);
 
 		/* Check next byte is PARAMETERS tag (82) */
 		if (skb->data[transaction->aid_len + 2] !=
-		    NFC_EVT_TRANSACTION_PARAMS_TAG)
+		    NFC_EVT_TRANSACTION_PARAMS_TAG) {
+			devm_kfree(dev, transaction);
 			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)))
+		if (transaction->params_len > ((skb->len - 2) -
+		    sizeof(struct nfc_evt_transaction))) {
+			devm_kfree(dev, transaction);
 			return -EINVAL;
+		}
 
 		memcpy(transaction->params, skb->data +
 		       transaction->aid_len + 4, transaction->params_len);
-- 
2.36.1.255.ge46751e96f-goog