[PATCH 4.14 310/338] nfc: Fix potential resource leaks

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

From: Miaoqian Lin <linmq006@xxxxxxxxx>

[ Upstream commit df49908f3c52d211aea5e2a14a93bbe67a2cb3af ]

nfc_get_device() take reference for the device, add missing
nfc_put_device() to release it when not need anymore.
Also fix the style warnning by use error EOPNOTSUPP instead of
ENOTSUPP.

Fixes: 5ce3f32b5264 ("NFC: netlink: SE API implementation")
Fixes: 29e76924cf08 ("nfc: netlink: Add capability to reply to vendor_cmd with data")
Signed-off-by: Miaoqian Lin <linmq006@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/nfc/netlink.c | 52 ++++++++++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 14 deletions(-)

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 0320ae7560ad..be06f4e37c43 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1506,6 +1506,7 @@ static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
 	u32 dev_idx, se_idx;
 	u8 *apdu;
 	size_t apdu_len;
+	int rc;
 
 	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 	    !info->attrs[NFC_ATTR_SE_INDEX] ||
@@ -1519,25 +1520,37 @@ static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
 	if (!dev)
 		return -ENODEV;
 
-	if (!dev->ops || !dev->ops->se_io)
-		return -ENOTSUPP;
+	if (!dev->ops || !dev->ops->se_io) {
+		rc = -EOPNOTSUPP;
+		goto put_dev;
+	}
 
 	apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
-	if (apdu_len == 0)
-		return -EINVAL;
+	if (apdu_len == 0) {
+		rc = -EINVAL;
+		goto put_dev;
+	}
 
 	apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
-	if (!apdu)
-		return -EINVAL;
+	if (!apdu) {
+		rc = -EINVAL;
+		goto put_dev;
+	}
 
 	ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
-	if (!ctx)
-		return -ENOMEM;
+	if (!ctx) {
+		rc = -ENOMEM;
+		goto put_dev;
+	}
 
 	ctx->dev_idx = dev_idx;
 	ctx->se_idx = se_idx;
 
-	return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
+	rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
+
+put_dev:
+	nfc_put_device(dev);
+	return rc;
 }
 
 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
@@ -1560,14 +1573,21 @@ static int nfc_genl_vendor_cmd(struct sk_buff *skb,
 	subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
 
 	dev = nfc_get_device(dev_idx);
-	if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
+	if (!dev)
 		return -ENODEV;
 
+	if (!dev->vendor_cmds || !dev->n_vendor_cmds) {
+		err = -ENODEV;
+		goto put_dev;
+	}
+
 	if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
 		data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
 		data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
-		if (data_len == 0)
-			return -EINVAL;
+		if (data_len == 0) {
+			err = -EINVAL;
+			goto put_dev;
+		}
 	} else {
 		data = NULL;
 		data_len = 0;
@@ -1582,10 +1602,14 @@ static int nfc_genl_vendor_cmd(struct sk_buff *skb,
 		dev->cur_cmd_info = info;
 		err = cmd->doit(dev, data, data_len);
 		dev->cur_cmd_info = NULL;
-		return err;
+		goto put_dev;
 	}
 
-	return -EOPNOTSUPP;
+	err = -EOPNOTSUPP;
+
+put_dev:
+	nfc_put_device(dev);
+	return err;
 }
 
 /* message building helper */
-- 
2.35.1