asix fixes

* usb_control_message() to/from stack (breaks on e.g. arm); some
  places did kmalloc() for buffer, some just worked from stack.
  Added kmalloc()/memcpy()/kfree() in asix_read_cmd()/asix_write_cmd(),
  removed that crap from callers.
* Fixed a leak in ax88172_bind() - on success it forgot to kfree() the
  buffer.
* Endianness bug in ax88178_bind() - we read a word from eeprom and work with
  it without converting to host-endian

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 105 insertions, 130 deletions

diff --git a/drivers/net/usb/asix.c b/drivers/net/usb/asix.c
index 61daa096de66..1249f444039e 100644
--- a/drivers/net/usb/asix.c
+++ b/drivers/net/usb/asix.c
@@ -172,45 +172,76 @@ struct asix_data {
 };
 
 struct ax88172_int_data {
-        u16 res1;
+        __le16 res1;
         u8 link;
-        u16 res2;
+        __le16 res2;
         u8 status;
-        u16 res3;
+        __le16 res3;
 } __attribute__ ((packed));
 
 static int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
                             u16 size, void *data)
 {
+        void *buf;
+        int err = -ENOMEM;
+
         devdbg(dev,"asix_read_cmd() cmd=0x%02x value=0x%04x index=0x%04x size=%d",
                 cmd, value, index, size);
-        return usb_control_msg(
+
+        buf = kmalloc(size, GFP_KERNEL);
+        if (!buf)
+                goto out;
+
+        err = usb_control_msg(
                 dev->udev,
                 usb_rcvctrlpipe(dev->udev, 0),
                 cmd,
                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                 value,
                 index,
-                data,
+                buf,
                 size,
                 USB_CTRL_GET_TIMEOUT);
+        if (err >= 0 && err < size)
+                err = -EINVAL;
+        if (!err)
+                memcpy(data, buf, size);
+        kfree(buf);
+
+out:
+        return err;
 }
 
 static int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
                              u16 size, void *data)
 {
+        void *buf = NULL;
+        int err = -ENOMEM;
+
         devdbg(dev,"asix_write_cmd() cmd=0x%02x value=0x%04x index=0x%04x size=%d",
                 cmd, value, index, size);
-        return usb_control_msg(
+
+        if (data) {
+                buf = kmalloc(size, GFP_KERNEL);
+                if (!buf)
+                        goto out;
+                memcpy(buf, data, size);
+        }
+
+        err = usb_control_msg(
                 dev->udev,
                 usb_sndctrlpipe(dev->udev, 0),
                 cmd,
                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                 value,
                 index,
-                data,
+                buf,
                 size,
                 USB_CTRL_SET_TIMEOUT);
+        kfree(buf);
+
+out:
+        return err;
 }
 
 static void asix_async_cmd_callback(struct urb *urb)
@@ -402,25 +433,19 @@ static inline int asix_set_hw_mii(struct usbnet *dev)
 
 static inline int asix_get_phy_addr(struct usbnet *dev)
 {
-        int ret = 0;
-        void *buf;
+        u8 buf[2];
+        int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);
 
         devdbg(dev, "asix_get_phy_addr()");
 
-        buf = kmalloc(2, GFP_KERNEL);
-        if (!buf)
-                goto out1;
-
-        if ((ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID,
-                                    0, 0, 2, buf)) < 2) {
+        if (ret < 0) {
                 deverr(dev, "Error reading PHYID register: %02x", ret);
-                goto out2;
+                goto out;
         }
-        devdbg(dev, "asix_get_phy_addr() returning 0x%04x", *((u16 *)buf));
-        ret = *((u8 *)buf + 1);
-out2:
-        kfree(buf);
-out1:
+        devdbg(dev, "asix_get_phy_addr() returning 0x%04x", *((__le16 *)buf));
+        ret = buf[1];
+
+out:
         return ret;
 }
 
@@ -437,22 +462,15 @@ static int asix_sw_reset(struct usbnet *dev, u8 flags)
 
 static u16 asix_read_rx_ctl(struct usbnet *dev)
 {
-        u16 ret = 0;
-        void *buf;
-
-        buf = kmalloc(2, GFP_KERNEL);
-        if (!buf)
-                goto out1;
+        __le16 v;
+        int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);
 
-        if ((ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL,
-                                    0, 0, 2, buf)) < 2) {
+        if (ret < 0) {
                 deverr(dev, "Error reading RX_CTL register: %02x", ret);
-                goto out2;
+                goto out;
         }
-        ret = le16_to_cpu(*((u16 *)buf));
-out2:
-        kfree(buf);
-out1:
+        ret = le16_to_cpu(v);
+out:
         return ret;
 }
 
@@ -471,22 +489,15 @@ static int asix_write_rx_ctl(struct usbnet *dev, u16 mode)
 
 static u16 asix_read_medium_status(struct usbnet *dev)
 {
-        u16 ret = 0;
-        void *buf;
+        __le16 v;
+        int ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS, 0, 0, 2, &v);
 
-        buf = kmalloc(2, GFP_KERNEL);
-        if (!buf)
-                goto out1;
-
-        if ((ret = asix_read_cmd(dev, AX_CMD_READ_MEDIUM_STATUS,
-                                    0, 0, 2, buf)) < 2) {
+        if (ret < 0) {
                 deverr(dev, "Error reading Medium Status register: %02x", ret);
-                goto out2;
+                goto out;
         }
-        ret = le16_to_cpu(*((u16 *)buf));
-out2:
-        kfree(buf);
-out1:
+        ret = le16_to_cpu(v);
+out:
         return ret;
 }
 
@@ -568,31 +579,30 @@ static void asix_set_multicast(struct net_device *net)
 static int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
 {
         struct usbnet *dev = netdev_priv(netdev);
-        u16 res;
+        __le16 res;
 
         mutex_lock(&dev->phy_mutex);
         asix_set_sw_mii(dev);
         asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
-                                (__u16)loc, 2, (u16 *)&res);
+                                (__u16)loc, 2, &res);
         asix_set_hw_mii(dev);
         mutex_unlock(&dev->phy_mutex);
 
-        devdbg(dev, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x", phy_id, loc, le16_to_cpu(res & 0xffff));
+        devdbg(dev, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x", phy_id, loc, le16_to_cpu(res));
 
-        return le16_to_cpu(res & 0xffff);
+        return le16_to_cpu(res);
 }
 
 static void
 asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 {
         struct usbnet *dev = netdev_priv(netdev);
-        u16 res = cpu_to_le16(val);
+        __le16 res = cpu_to_le16(val);
 
         devdbg(dev, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x", phy_id, loc, val);
         mutex_lock(&dev->phy_mutex);
         asix_set_sw_mii(dev);
-        asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
-                                (__u16)loc, 2, (u16 *)&res);
+        asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, &res);
         asix_set_hw_mii(dev);
         mutex_unlock(&dev->phy_mutex);
 }
@@ -644,7 +654,6 @@ asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
 {
         struct usbnet *dev = netdev_priv(net);
         u8 opt = 0;
-        u8 buf[1];
 
         if (wolinfo->wolopts & WAKE_PHY)
                 opt |= AX_MONITOR_LINK;
@@ -654,7 +663,7 @@ asix_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
                 opt |= AX_MONITOR_MODE;
 
         if (asix_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
-                              opt, 0, 0, &buf) < 0)
+                              opt, 0, 0, NULL) < 0)
                 return -EINVAL;
 
         return 0;
@@ -672,7 +681,7 @@ static int asix_get_eeprom(struct net_device *net,
                               struct ethtool_eeprom *eeprom, u8 *data)
 {
         struct usbnet *dev = netdev_priv(net);
-        u16 *ebuf = (u16 *)data;
+        __le16 *ebuf = (__le16 *)data;
         int i;
 
         /* Crude hack to ensure that we don't overwrite memory
@@ -801,7 +810,7 @@ static int ax88172_link_reset(struct usbnet *dev)
 static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf)
 {
         int ret = 0;
-        void *buf;
+        u8 buf[ETH_ALEN];
         int i;
         unsigned long gpio_bits = dev->driver_info->data;
         struct asix_data *data = (struct asix_data *)&dev->data;
@@ -810,30 +819,23 @@ static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf)
 
         usbnet_get_endpoints(dev,intf);
 
-        buf = kmalloc(ETH_ALEN, GFP_KERNEL);
-        if(!buf) {
-                ret = -ENOMEM;
-                goto out1;
-        }
-
         /* Toggle the GPIOs in a manufacturer/model specific way */
         for (i = 2; i >= 0; i--) {
                 if ((ret = asix_write_cmd(dev, AX_CMD_WRITE_GPIOS,
                                         (gpio_bits >> (i * 8)) & 0xff, 0, 0,
-                                        buf)) < 0)
-                        goto out2;
+                                        NULL)) < 0)
+                        goto out;
                 msleep(5);
         }
 
         if ((ret = asix_write_rx_ctl(dev, 0x80)) < 0)
-                goto out2;
+                goto out;
 
         /* Get the MAC address */
-        memset(buf, 0, ETH_ALEN);
         if ((ret = asix_read_cmd(dev, AX88172_CMD_READ_NODE_ID,
-                                0, 0, 6, buf)) < 0) {
+                                0, 0, ETH_ALEN, buf)) < 0) {
                 dbg("read AX_CMD_READ_NODE_ID failed: %d", ret);
-                goto out2;
+                goto out;
         }
         memcpy(dev->net->dev_addr, buf, ETH_ALEN);
 
@@ -855,9 +857,8 @@ static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf)
         mii_nway_restart(&dev->mii);
 
         return 0;
-out2:
-        kfree(buf);
-out1:
+
+out:
         return ret;
 }
 
@@ -900,66 +901,58 @@ static int ax88772_link_reset(struct usbnet *dev)
 static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
 {
         int ret, embd_phy;
-        void *buf;
         u16 rx_ctl;
         struct asix_data *data = (struct asix_data *)&dev->data;
+        u8 buf[ETH_ALEN];
         u32 phyid;
 
         data->eeprom_len = AX88772_EEPROM_LEN;
 
         usbnet_get_endpoints(dev,intf);
 
-        buf = kmalloc(6, GFP_KERNEL);
-        if(!buf) {
-                dbg ("Cannot allocate memory for buffer");
-                ret = -ENOMEM;
-                goto out1;
-        }
-
         if ((ret = asix_write_gpio(dev,
                         AX_GPIO_RSE | AX_GPIO_GPO_2 | AX_GPIO_GPO2EN, 5)) < 0)
-                goto out2;
+                goto out;
 
         /* 0x10 is the phy id of the embedded 10/100 ethernet phy */
         embd_phy = ((asix_get_phy_addr(dev) & 0x1f) == 0x10 ? 1 : 0);
         if ((ret = asix_write_cmd(dev, AX_CMD_SW_PHY_SELECT,
-                                embd_phy, 0, 0, buf)) < 0) {
+                                embd_phy, 0, 0, NULL)) < 0) {
                 dbg("Select PHY #1 failed: %d", ret);
-                goto out2;
+                goto out;
         }
 
         if ((ret = asix_sw_reset(dev, AX_SWRESET_IPPD | AX_SWRESET_PRL)) < 0)
-                goto out2;
+                goto out;
 
         msleep(150);
         if ((ret = asix_sw_reset(dev, AX_SWRESET_CLEAR)) < 0)
-                goto out2;
+                goto out;
 
         msleep(150);
         if (embd_phy) {
                 if ((ret = asix_sw_reset(dev, AX_SWRESET_IPRL)) < 0)
-                        goto out2;
+                        goto out;
         }
         else {
                 if ((ret = asix_sw_reset(dev, AX_SWRESET_PRTE)) < 0)
-                        goto out2;
+                        goto out;
         }
 
         msleep(150);
         rx_ctl = asix_read_rx_ctl(dev);
         dbg("RX_CTL is 0x%04x after software reset", rx_ctl);
         if ((ret = asix_write_rx_ctl(dev, 0x0000)) < 0)
-                goto out2;
+                goto out;
 
         rx_ctl = asix_read_rx_ctl(dev);
         dbg("RX_CTL is 0x%04x setting to 0x0000", rx_ctl);
 
         /* Get the MAC address */
-        memset(buf, 0, ETH_ALEN);
         if ((ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID,
                                 0, 0, ETH_ALEN, buf)) < 0) {
                 dbg("Failed to read MAC address: %d", ret);
-                goto out2;
+                goto out;
         }
         memcpy(dev->net->dev_addr, buf, ETH_ALEN);
 
@@ -976,12 +969,12 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
         dbg("PHYID=0x%08x", phyid);
 
         if ((ret = asix_sw_reset(dev, AX_SWRESET_PRL)) < 0)
-                goto out2;
+                goto out;
 
         msleep(150);
 
         if ((ret = asix_sw_reset(dev, AX_SWRESET_IPRL | AX_SWRESET_PRL)) < 0)
-                goto out2;
+                goto out;
 
         msleep(150);
 
@@ -994,18 +987,18 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
         mii_nway_restart(&dev->mii);
 
         if ((ret = asix_write_medium_mode(dev, AX88772_MEDIUM_DEFAULT)) < 0)
-                goto out2;
+                goto out;
 
         if ((ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
                                 AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
-                                AX88772_IPG2_DEFAULT, 0, buf)) < 0) {
+                                AX88772_IPG2_DEFAULT, 0, NULL)) < 0) {
                 dbg("Write IPG,IPG1,IPG2 failed: %d", ret);
-                goto out2;
+                goto out;
         }
 
         /* Set RX_CTL to default values with 2k buffer, and enable cactus */
         if ((ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL)) < 0)
-                goto out2;
+                goto out;
 
         rx_ctl = asix_read_rx_ctl(dev);
         dbg("RX_CTL is 0x%04x after all initializations", rx_ctl);
@@ -1013,20 +1006,15 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
         rx_ctl = asix_read_medium_status(dev);
         dbg("Medium Status is 0x%04x after all initializations", rx_ctl);
 
-        kfree(buf);
-
         /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
         if (dev->driver_info->flags & FLAG_FRAMING_AX) {
                 /* hard_mtu  is still the default - the device does not support
                    jumbo eth frames */
                 dev->rx_urb_size = 2048;
         }
-
         return 0;
 
-out2:
-        kfree(buf);
-out1:
+out:
         return ret;
 }
 
@@ -1195,23 +1183,16 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf)
 {
         struct asix_data *data = (struct asix_data *)&dev->data;
         int ret;
-        void *buf;
-        u16 eeprom;
+        u8 buf[ETH_ALEN];
+        __le16 eeprom;
+        u8 status;
         int gpio0 = 0;
         u32 phyid;
 
         usbnet_get_endpoints(dev,intf);
 
-        buf = kmalloc(6, GFP_KERNEL);
-        if(!buf) {
-                dbg ("Cannot allocate memory for buffer");
-                ret = -ENOMEM;
-                goto out1;
-        }
-
-        eeprom = 0;
-        asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &eeprom);
-        dbg("GPIO Status: 0x%04x", eeprom);
+        asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &status);
+        dbg("GPIO Status: 0x%04x", status);
 
         asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0, 0, 0, NULL);
         asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, &eeprom);
@@ -1219,19 +1200,19 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf)
 
         dbg("EEPROM index 0x17 is 0x%04x", eeprom);
 
-        if (eeprom == 0xffff) {
+        if (eeprom == cpu_to_le16(0xffff)) {
                 data->phymode = PHY_MODE_MARVELL;
                 data->ledmode = 0;
                 gpio0 = 1;
         } else {
-                data->phymode = eeprom & 7;
-                data->ledmode = eeprom >> 8;
-                gpio0 = (eeprom & 0x80) ? 0 : 1;
+                data->phymode = le16_to_cpu(eeprom) & 7;
+                data->ledmode = le16_to_cpu(eeprom) >> 8;
+                gpio0 = (le16_to_cpu(eeprom) & 0x80) ? 0 : 1;
         }
         dbg("GPIO0: %d, PhyMode: %d", gpio0, data->phymode);
 
         asix_write_gpio(dev, AX_GPIO_RSE | AX_GPIO_GPO_1 | AX_GPIO_GPO1EN, 40);
-        if ((eeprom >> 8) != 1) {
+        if ((le16_to_cpu(eeprom) >> 8) != 1) {
                 asix_write_gpio(dev, 0x003c, 30);
                 asix_write_gpio(dev, 0x001c, 300);
                 asix_write_gpio(dev, 0x003c, 30);
@@ -1250,11 +1231,10 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf)
         asix_write_rx_ctl(dev, 0);
 
         /* Get the MAC address */
-        memset(buf, 0, ETH_ALEN);
         if ((ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID,
                                 0, 0, ETH_ALEN, buf)) < 0) {
                 dbg("Failed to read MAC address: %d", ret);
-                goto out2;
+                goto out;
         }
         memcpy(dev->net->dev_addr, buf, ETH_ALEN);
 
@@ -1289,12 +1269,10 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf)
         mii_nway_restart(&dev->mii);
 
         if ((ret = asix_write_medium_mode(dev, AX88178_MEDIUM_DEFAULT)) < 0)
-                goto out2;
+                goto out;
 
         if ((ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL)) < 0)
-                goto out2;
-
-        kfree(buf);
+                goto out;
 
         /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
         if (dev->driver_info->flags & FLAG_FRAMING_AX) {
@@ -1302,12 +1280,9 @@ static int ax88178_bind(struct usbnet *dev, struct usb_interface *intf)
                    jumbo eth frames */
                 dev->rx_urb_size = 2048;
         }
-
         return 0;
 
-out2:
-        kfree(buf);
-out1:
+out:
         return ret;
 }