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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: 5ce3f32b52 ("NFC: netlink: SE API implementation")
Fixes: 29e76924cf ("nfc: netlink: Add capability to reply to vendor_cmd with data")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Miaoqian Lin 2022-12-23 11:37:18 +04:00 committed by David S. Miller
parent 30e7255375
commit df49908f3c
1 changed files with 38 additions and 14 deletions
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52
net/nfc/netlink.c
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@ -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 */