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Date: Tue, 3 Aug 2021 18:45:11 +0300
From: Petko Manolov <petko.manolov@...sulko.com>
To: Pavel Skripkin <paskripkin@...il.com>
Cc: netdev@...r.kernel.org, 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 21-08-03 18:28:55, Pavel Skripkin wrote:
> 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
Yeah, the patch was never compiled. Sorry about it. v2 is coming up.
> > ---
> > 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
>
> ...
It actually is, i just shuffled the var definitions.
> > 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
thanks,
Petko
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