[PATCH 4.19 40/50] NFC: digital: fix possible memory leak in digital_in_send_sdd_req()

Greg Kroah-Hartman
2021-10-18T13:33:09Z

From: Ziyang Xuan <william.xuanziyang@huawei.com>

commit 291c932fc3692e4d211a445ba8aa35663831bac7 upstream.

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

Fixes: 2c66daecc409 ("NFC Digital: Add NFC-A technology support")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/nfc/digital_technology.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/net/nfc/digital_technology.c
+++ b/net/nfc/digital_technology.c
@@ -474,8 +474,12 @@ static int digital_in_send_sdd_req(struc
skb_put_u8(skb, sel_cmd);
skb_put_u8(skb, DIGITAL_SDD_REQ_SEL_PAR);

- return digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
- target);
+ rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sdd_res,
+ target);
+ if (rc)
+ kfree_skb(skb);
+
+ return rc;
}

static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,