linux-kernel - [PATCH net 1/2] NFC: digital: fix possible memory leak in digital_tg_listen

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Message-ID: <4e3578352a4548feb1d3087c7ec38fedab18292d.1634111083.git.william.xuanziyang@huawei.com>
Date:   Wed, 13 Oct 2021 15:50:12 +0800
From:   Ziyang Xuan <william.xuanziyang@...wei.com>
To:     <krzysztof.kozlowski@...onical.com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH net 1/2] NFC: digital: fix possible memory leak in digital_tg_listen_mdaa()

'params' is allocated in digital_tg_listen_mdaa(), but not free when
digital_send_cmd() failed, which will cause memory leak. Fix it by
freeing 'params' if digital_send_cmd() return failed.

Fixes: 1c7a4c24fbfd ("NFC Digital: Add target NFC-DEP support")
Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>
---
 net/nfc/digital_core.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/net/nfc/digital_core.c b/net/nfc/digital_core.c
index fefc03674f4f..d63d2e5dc60c 100644
--- a/net/nfc/digital_core.c
+++ b/net/nfc/digital_core.c
@@ -277,6 +277,7 @@ int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
 static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
 {
 	struct digital_tg_mdaa_params *params;
+	int rc;
 
 	params = kzalloc(sizeof(*params), GFP_KERNEL);
 	if (!params)
@@ -291,8 +292,12 @@ static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
 	get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
 	params->sc = DIGITAL_SENSF_FELICA_SC;
 
-	return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
-				500, digital_tg_recv_atr_req, NULL);
+	rc = digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
+			      500, digital_tg_recv_atr_req, NULL);
+	if (rc)
+		kfree(params);
+
+	return rc;
 }
 
 static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
-- 
2.25.1