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Message-ID: <eeb03520-f57a-1c78-fe84-0b72edea371f@gmail.com>
Date: Tue, 3 Aug 2021 18:28:55 +0300
From: Pavel Skripkin <paskripkin@...il.com>
To: Petko Manolov <petko.manolov@...sulko.com>, netdev@...r.kernel.org
Cc: davem@...emloft.net, gregkh@...uxfoundation.org,
Petko Manolov <petkan@...leusys.com>
Subject: Re: [PATCH net 1/2] net: usb: pegasus: Check the return value of
get_geristers() and friends;
On 8/3/21 6:03 PM, Petko Manolov wrote:
> From: Petko Manolov <petkan@...leusys.com>
>
> Certain call sites of get_geristers() did not do proper error handling. This
> could be a problem as get_geristers() typically return the data via pointer to a
> buffer. If an error occured the code is carelessly manipulating the wrong data.
>
> Signed-off-by: Petko Manolov <petkan@...leusys.com>
Hi, Petko!
This patch looks good to me, but I found few small mistakes
> ---
> drivers/net/usb/pegasus.c | 102 ++++++++++++++++++++++++++------------
> 1 file changed, 70 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
> index 9a907182569c..924be11ee72c 100644
> --- a/drivers/net/usb/pegasus.c
> +++ b/drivers/net/usb/pegasus.c
> @@ -132,9 +132,15 @@ static int get_registers(pegasus_t *pegasus, __u16 indx, __u16 size, void *data)
> static int set_registers(pegasus_t *pegasus, __u16 indx, __u16 size,
> const void *data)
> {
> - return usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REGS,
> + int ret;
> +
> + ret = usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REGS,
> PEGASUS_REQT_WRITE, 0, indx, data, size,
> 1000, GFP_NOIO);
> + if (ret < 0)
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed with %d\n", __func__, ret);
> +
> + return ret;
> }
>
> /*
> @@ -145,10 +151,15 @@ static int set_registers(pegasus_t *pegasus, __u16 indx, __u16 size,
> static int set_register(pegasus_t *pegasus, __u16 indx, __u8 data)
> {
> void *buf = &data;
> + int ret;
>
> - return usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REG,
> + ret = usb_control_msg_send(pegasus->usb, 0, PEGASUS_REQ_SET_REG,
> PEGASUS_REQT_WRITE, data, indx, buf, 1,
> 1000, GFP_NOIO);
> + if (ret < 0)
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed with %d\n", __func__, ret);
> +
> + return ret;
> }
>
> static int update_eth_regs_async(pegasus_t *pegasus)
> @@ -188,10 +199,9 @@ static int update_eth_regs_async(pegasus_t *pegasus)
>
> static int __mii_op(pegasus_t *p, __u8 phy, __u8 indx, __u16 *regd, __u8 cmd)
> {
> - int i;
> - __u8 data[4] = { phy, 0, 0, indx };
> + int i, ret = -ETIMEDOUT;
> __le16 regdi;
> - int ret = -ETIMEDOUT;
> + __u8 data[4] = { phy, 0, 0, indx };
>
> if (cmd & PHY_WRITE) {
> __le16 *t = (__le16 *) & data[1];
> @@ -211,8 +221,9 @@ static int __mii_op(pegasus_t *p, __u8 phy, __u8 indx, __u16 *regd, __u8 cmd)
> goto fail;
...
if (i >= REG_TIMEOUT)
goto fail; <--- ret needs initialization here
...
> if (cmd & PHY_READ) {
> ret = get_registers(p, PhyData, 2, ®di);
> + if (ret < 0)
> + goto fail;
> *regd = le16_to_cpu(regdi);
> - return ret;
> }
> return 0;
> fail:
> @@ -235,9 +246,13 @@ static int write_mii_word(pegasus_t *pegasus, __u8 phy, __u8 indx, __u16 *regd)
> static int mdio_read(struct net_device *dev, int phy_id, int loc)
> {
> pegasus_t *pegasus = netdev_priv(dev);
> + int ret;
> u16 res;
>
> - read_mii_word(pegasus, phy_id, loc, &res);
> + ret = read_mii_word(pegasus, phy_id, loc, &res);
> + if (ret < 0)
> + return ret;
> +
> return (int)res;
> }
>
> @@ -251,10 +266,9 @@ static void mdio_write(struct net_device *dev, int phy_id, int loc, int val)
>
> static int read_eprom_word(pegasus_t *pegasus, __u8 index, __u16 *retdata)
> {
> - int i;
> - __u8 tmp = 0;
> + int ret, i;
> __le16 retdatai;
> - int ret;
> + __u8 tmp = 0;
>
> set_register(pegasus, EpromCtrl, 0);
> set_register(pegasus, EpromOffset, index);
> @@ -262,21 +276,25 @@ static int read_eprom_word(pegasus_t *pegasus, __u8 index, __u16 *retdata)
>
> for (i = 0; i < REG_TIMEOUT; i++) {
> ret = get_registers(pegasus, EpromCtrl, 1, &tmp);
> + if (ret < 0)
> + goto fail;
> if (tmp & EPROM_DONE)
> break;
> - if (ret == -ESHUTDOWN)
> - goto fail;
> }
> - if (i >= REG_TIMEOUT)
> + if (i >= REG_TIMEOUT) {
> + ret = -ETIMEDOUT;
> goto fail;
> + }
>
> ret = get_registers(pegasus, EpromData, 2, &retdatai);
> + if (ret < 0)
> + goto fail;
> *retdata = le16_to_cpu(retdatai);
> return ret;
>
> fail:
> - netif_warn(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> - return -ETIMEDOUT;
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> + return ret;
> }
>
> #ifdef PEGASUS_WRITE_EEPROM
> @@ -324,10 +342,10 @@ static int write_eprom_word(pegasus_t *pegasus, __u8 index, __u16 data)
> return ret;
>
> fail:
> - netif_warn(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> return -ETIMEDOUT;
> }
> -#endif /* PEGASUS_WRITE_EEPROM */
> +#endif /* PEGASUS_WRITE_EEPROM */
>
> static inline int get_node_id(pegasus_t *pegasus, u8 *id)
> {
> @@ -367,19 +385,21 @@ static void set_ethernet_addr(pegasus_t *pegasus)
> return;
> err:
> eth_hw_addr_random(pegasus->net);
> - dev_info(&pegasus->intf->dev, "software assigned MAC address.\n");
> + netif_dbg(pegasus, drv, pegasus->net, "software assigned MAC address.\n");
>
> return;
> }
>
> static inline int reset_mac(pegasus_t *pegasus)
> {
> + int ret, i;
> __u8 data = 0x8;
> - int i;
>
> set_register(pegasus, EthCtrl1, data);
> for (i = 0; i < REG_TIMEOUT; i++) {
> - get_registers(pegasus, EthCtrl1, 1, &data);
> + ret = get_registers(pegasus, EthCtrl1, 1, &data);
> + if (ret < 0)
> + goto fail;
> if (~data & 0x08) {
> if (loopback)
> break;
> @@ -402,22 +422,29 @@ static inline int reset_mac(pegasus_t *pegasus)
> }
> if (usb_dev_id[pegasus->dev_index].vendor == VENDOR_ELCON) {
> __u16 auxmode;
> - read_mii_word(pegasus, 3, 0x1b, &auxmode);
> + ret = read_mii_word(pegasus, 3, 0x1b, &auxmode);
> + if (ret < 0)
> + goto fail;
> auxmode |= 4;
> write_mii_word(pegasus, 3, 0x1b, &auxmode);
> }
>
> return 0;
> +fail:
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> + return ret;
> }
>
> static int enable_net_traffic(struct net_device *dev, struct usb_device *usb)
> {
> - __u16 linkpart;
> - __u8 data[4];
> pegasus_t *pegasus = netdev_priv(dev);
> int ret;
> + __u16 linkpart;
> + __u8 data[4];
>
> - read_mii_word(pegasus, pegasus->phy, MII_LPA, &linkpart);
> + ret = read_mii_word(pegasus, pegasus->phy, MII_LPA, &linkpart);
> + if (ret < 0)
> + goto fail;
> data[0] = 0xc8; /* TX & RX enable, append status, no CRC */
> data[1] = 0;
> if (linkpart & (ADVERTISE_100FULL | ADVERTISE_10FULL))
> @@ -435,11 +462,16 @@ static int enable_net_traffic(struct net_device *dev, struct usb_device *usb)
> usb_dev_id[pegasus->dev_index].vendor == VENDOR_LINKSYS2 ||
> usb_dev_id[pegasus->dev_index].vendor == VENDOR_DLINK) {
> u16 auxmode;
> - read_mii_word(pegasus, 0, 0x1b, &auxmode);
> + ret = read_mii_word(pegasus, 0, 0x1b, &auxmode);
> + if (ret < 0)
> + goto fail;
> auxmode |= 4;
> write_mii_word(pegasus, 0, 0x1b, &auxmode);
> }
>
> + return 0;
> +fail:
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> return ret;
> }
>
> @@ -447,9 +479,9 @@ static void read_bulk_callback(struct urb *urb)
> {
> pegasus_t *pegasus = urb->context;
> struct net_device *net;
> + u8 *buf = urb->transfer_buffer;
> int rx_status, count = urb->actual_length;
> int status = urb->status;
> - u8 *buf = urb->transfer_buffer;
> __u16 pkt_len;
>
> if (!pegasus)
> @@ -998,8 +1030,7 @@ static int pegasus_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
> data[0] = pegasus->phy;
> fallthrough;
> case SIOCDEVPRIVATE + 1:
> - read_mii_word(pegasus, data[0], data[1] & 0x1f, &data[3]);
> - res = 0;
> + res = read_mii_word(pegasus, data[0], data[1] & 0x1f, &data[3]);
> break;
> case SIOCDEVPRIVATE + 2:
> if (!capable(CAP_NET_ADMIN))
> @@ -1033,22 +1064,25 @@ static void pegasus_set_multicast(struct net_device *net)
>
> static __u8 mii_phy_probe(pegasus_t *pegasus)
> {
> - int i;
> + int i, ret;
> __u16 tmp;
>
> for (i = 0; i < 32; i++) {
> - read_mii_word(pegasus, i, MII_BMSR, &tmp);
> + ret = read_mii_word(pegasus, i, MII_BMSR, &tmp)
Semicolon missing
> + if (ret < 0)
> + goto out;
Should be "goto fail;"
> if (tmp == 0 || tmp == 0xffff || (tmp & BMSR_MEDIA) == 0)
> continue;
> else
> return i;
> }
> -
> +fail:
> return 0xff;
> }
>
> static inline void setup_pegasus_II(pegasus_t *pegasus)
> {
> + int ret;
> __u8 data = 0xa5;
>
> set_register(pegasus, Reg1d, 0);
> @@ -1060,7 +1094,9 @@ static inline void setup_pegasus_II(pegasus_t *pegasus)
> set_register(pegasus, Reg7b, 2);
>
> set_register(pegasus, 0x83, data);
> - get_registers(pegasus, 0x83, 1, &data);
> + ret = get_registers(pegasus, 0x83, 1, &data);
> + if (ret < 0)
> + goto fail;
>
> if (data == 0xa5)
> pegasus->chip = 0x8513;
> @@ -1075,6 +1111,8 @@ static inline void setup_pegasus_II(pegasus_t *pegasus)
> set_register(pegasus, Reg81, 6);
> else
> set_register(pegasus, Reg81, 2);
There should be "return" before fail label, I guess.
> +fail:
> + netif_dbg(pegasus, drv, pegasus->net, "%s failed\n", __func__);
> }
>
> static void check_carrier(struct work_struct *work)
>
With regards,
Pavel Skripkin
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