[PATCH 4.19 06/48] nfc: s3fwrn5: Fix potential memory leak in s3fwrn5_nci_send()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Shang XiaoJing <shangxiaojing@huawei.com>

[ Upstream commit 3a146b7e3099dc7cf3114f627d9b79291e2d2203 ]

s3fwrn5_nci_send() will call s3fwrn5_i2c_write() or s3fwrn82_uart_write(),
and free the skb if write() failed. However, even if the write() run
succeeds, the skb will not be freed in write(). As the result, the skb
will memleak. s3fwrn5_nci_send() should also free the skb when write()
succeeds.

Fixes: c04c674fadeb ("nfc: s3fwrn5: Add driver for Samsung S3FWRN5 NFC Chip")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nfc/s3fwrn5/core.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/s3fwrn5/core.c b/drivers/nfc/s3fwrn5/core.c
index 64b58455e620..f23a1e4d7e1e 100644
--- a/drivers/nfc/s3fwrn5/core.c
+++ b/drivers/nfc/s3fwrn5/core.c
@@ -108,11 +108,15 @@ static int s3fwrn5_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
 	}
 
 	ret = s3fwrn5_write(info, skb);
-	if (ret < 0)
+	if (ret < 0) {
 		kfree_skb(skb);
+		mutex_unlock(&info->mutex);
+		return ret;
+	}
 
+	consume_skb(skb);
 	mutex_unlock(&info->mutex);
-	return ret;
+	return 0;
 }
 
 static int s3fwrn5_nci_post_setup(struct nci_dev *ndev)
-- 
2.35.1