* [PATCH] nfc: Fix potential resource leaks
@ 2022-12-20 13:46 Miaoqian Lin
2022-12-20 14:18 ` Michal Swiatkowski
2022-12-21 9:45 ` Krzysztof Kozlowski
0 siblings, 2 replies; 3+ messages in thread
From: Miaoqian Lin @ 2022-12-20 13:46 UTC (permalink / raw)
To: Krzysztof Kozlowski, David S. Miller, Eric Dumazet,
Jakub Kicinski, Paolo Abeni, Samuel Ortiz, Christophe Ricard,
netdev, linux-kernel
Cc: linmq006
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@gmail.com>
---
net/nfc/netlink.c | 51 ++++++++++++++++++++++++++++++++++-------------
1 file changed, 37 insertions(+), 14 deletions(-)
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 9d91087b9399..d081beaf4828 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 error;
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) {
+ error = -EOPNOTSUPP;
+ goto put_dev;
+ }
apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
- if (apdu_len == 0)
- return -EINVAL;
+ if (apdu_len == 0) {
+ error = -EINVAL;
+ goto put_dev;
+ }
apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
- if (!apdu)
- return -EINVAL;
+ if (!apdu) {
+ error = -EINVAL;
+ goto put_dev;
+ }
ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
- if (!ctx)
- return -ENOMEM;
+ if (!ctx) {
+ error = -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);
+ error = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
+
+put_dev:
+ nfc_put_device(dev);
+ return error;
}
static int nfc_genl_vendor_cmd(struct sk_buff *skb,
@@ -1551,14 +1564,20 @@ 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 +1592,14 @@ 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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] nfc: Fix potential resource leaks
2022-12-20 13:46 [PATCH] nfc: Fix potential resource leaks Miaoqian Lin
@ 2022-12-20 14:18 ` Michal Swiatkowski
2022-12-21 9:45 ` Krzysztof Kozlowski
1 sibling, 0 replies; 3+ messages in thread
From: Michal Swiatkowski @ 2022-12-20 14:18 UTC (permalink / raw)
To: Miaoqian Lin
Cc: Krzysztof Kozlowski, David S. Miller, Eric Dumazet,
Jakub Kicinski, Paolo Abeni, Samuel Ortiz, Christophe Ricard,
netdev, linux-kernel
On Tue, Dec 20, 2022 at 05:46:23PM +0400, Miaoqian Lin wrote:
> 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@gmail.com>
> ---
Nice catch
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] nfc: Fix potential resource leaks
2022-12-20 13:46 [PATCH] nfc: Fix potential resource leaks Miaoqian Lin
2022-12-20 14:18 ` Michal Swiatkowski
@ 2022-12-21 9:45 ` Krzysztof Kozlowski
1 sibling, 0 replies; 3+ messages in thread
From: Krzysztof Kozlowski @ 2022-12-21 9:45 UTC (permalink / raw)
To: Miaoqian Lin, David S. Miller, Eric Dumazet, Jakub Kicinski,
Paolo Abeni, Samuel Ortiz, Christophe Ricard, netdev,
linux-kernel
On 20/12/2022 14:46, Miaoqian Lin wrote:
> 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@gmail.com>
> ---
> net/nfc/netlink.c | 51 ++++++++++++++++++++++++++++++++++-------------
> 1 file changed, 37 insertions(+), 14 deletions(-)
>
> diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
> index 9d91087b9399..d081beaf4828 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 error;
Let's don't introduce the third or fourth style. Existing code calls it
"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) {
> + error = -EOPNOTSUPP;
> + goto put_dev;
> + }
>
> apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
> - if (apdu_len == 0)
> - return -EINVAL;
> + if (apdu_len == 0) {
> + error = -EINVAL;
> + goto put_dev;
> + }
>
> apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
> - if (!apdu)
> - return -EINVAL;
> + if (!apdu) {
> + error = -EINVAL;
> + goto put_dev;
> + }
>
> ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
> - if (!ctx)
> - return -ENOMEM;
> + if (!ctx) {
> + error = -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);
> + error = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
> +
> +put_dev:
> + nfc_put_device(dev);
> + return error;
> }
>
> static int nfc_genl_vendor_cmd(struct sk_buff *skb,
> @@ -1551,14 +1564,20 @@ 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;
Blank line
> + 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 +1592,14 @@ 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 */
Best regards,
Krzysztof
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-12-20 13:46 [PATCH] nfc: Fix potential resource leaks Miaoqian Lin
2022-12-20 14:18 ` Michal Swiatkowski
2022-12-21 9:45 ` Krzysztof Kozlowski
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