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net: asix: add proper error handling of usb read errors

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Syzbot once again hit uninit value in asix driver. The problem still the
same -- asix_read_cmd() reads less bytes, than was requested by caller.

Since all read requests are performed via asix_read_cmd() let's catch
usb related error there and add __must_check notation to be sure all
callers actually check return value.

So, this patch adds sanity check inside asix_read_cmd(), that simply
checks if bytes read are not less, than was requested and adds missing
error handling of asix_read_cmd() all across the driver code.

Fixes: d9fe64e511 ("net: asix: Add in_pm parameter")
Reported-and-tested-by: syzbot+6ca9f7867b77c2d316ac@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Tested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Skripkin 2022-02-06 21:05:16 +03:00 committed by David S. Miller
parent b845bac8ed
commit 920a9fa27e
3 changed files with 33 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/net/usb/asix.h
View File

@ -192,8 +192,8 @@ extern const struct driver_info ax88172a_info;
/* ASIX specific flags */
#define FLAG_EEPROM_MAC (1UL << 0) /* init device MAC from eeprom */
int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
u16 size, void *data, int in_pm);
int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
u16 size, void *data, int in_pm);
int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
u16 size, void *data, int in_pm);

19
drivers/net/usb/asix_common.c
View File

@ -11,8 +11,8 @@
#define AX_HOST_EN_RETRIES 30
int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
u16 size, void *data, int in_pm)
int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
u16 size, void *data, int in_pm)
{
int ret;
int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
@ -27,9 +27,12 @@ int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, index, data, size);
if (unlikely(ret < 0))
if (unlikely(ret < size)) {
ret = ret < 0 ? ret : -ENODATA;
netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
index, ret);
}
return ret;
}
@ -79,7 +82,7 @@ static int asix_check_host_enable(struct usbnet *dev, int in_pm)
0, 0, 1, &smsr, in_pm);
if (ret == -ENODEV)
break;
else if (ret < sizeof(smsr))
else if (ret < 0)
continue;
else if (smsr & AX_HOST_EN)
break;
@ -579,8 +582,12 @@ int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
return ret;
}
asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
(__u16)loc, 2, &res, 1);
ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
(__u16)loc, 2, &res, 1);
if (ret < 0) {
mutex_unlock(&dev->phy_mutex);
return ret;
}
asix_set_hw_mii(dev, 1);
mutex_unlock(&dev->phy_mutex);

21
drivers/net/usb/asix_devices.c
View File

@ -755,7 +755,12 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
priv->phy_addr = ret;
priv->embd_phy = ((priv->phy_addr & 0x1f) == 0x10);
asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &chipcode, 0);
ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &chipcode, 0);
if (ret < 0) {
netdev_dbg(dev->net, "Failed to read STATMNGSTS_REG: %d\n", ret);
return ret;
}
chipcode &= AX_CHIPCODE_MASK;
ret = (chipcode == AX_AX88772_CHIPCODE) ? ax88772_hw_reset(dev, 0) :
@ -919,11 +924,21 @@ static int ax88178_reset(struct usbnet *dev)
int gpio0 = 0;
u32 phyid;
asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &status, 0);
ret = asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &status, 0);
if (ret < 0) {
netdev_dbg(dev->net, "Failed to read GPIOS: %d\n", ret);
return ret;
}
netdev_dbg(dev->net, "GPIO Status: 0x%04x\n", status);
asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0, 0, 0, NULL, 0);
asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, &eeprom, 0);
ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, &eeprom, 0);
if (ret < 0) {
netdev_dbg(dev->net, "Failed to read EEPROM: %d\n", ret);
return ret;
}
asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0, 0, 0, NULL, 0);
netdev_dbg(dev->net, "EEPROM index 0x17 is 0x%04x\n", eeprom);