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Message-Id: <20221223073718.805935-1-linmq006@gmail.com>
Date: Fri, 23 Dec 2022 11:37:18 +0400
From: Miaoqian Lin <linmq006@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Samuel Ortiz <sameo@...ux.intel.com>,
Christophe Ricard <christophe.ricard@...il.com>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: linmq006@...il.com
Subject: [PATCH v2] nfc: Fix potential resource leaks
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@...il.com>
---
changes in v2:
- rename error to rc.
- add blank line.
v1: https://lore.kernel.org/all/20221220134623.2084443-1-linmq006@gmail.com/
---
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 9d91087b9399..1fc339084d89 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1497,6 +1497,7 @@ 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] ||
@@ -1510,25 +1511,37 @@ 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,
@@ -1551,14 +1564,21 @@ 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;
@@ -1573,10 +1593,14 @@ 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 */
--
2.25.1
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