[PATCH 5.13 019/127] net: usb: pegasus: Check the return value of get_geristers() and friends;

Sasha Levin
2021-08-24T16:57:11Z

From: Petko Manolov <petkan@nucleusys.com>

[ Upstream commit 8a160e2e9aeb8318159b48701ad8a6e22274372d ]

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 occurred the code is carelessly manipulating the wrong data.

Signed-off-by: Petko Manolov <petkan@nucleusys.com>
Reviewed-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/usb/pegasus.c | 108 ++++++++++++++++++++++++++------------
1 file changed, 75 insertions(+), 33 deletions(-)

diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index bc2dbf86496b..a08a46fef0d2 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;
__le16 regdi;
- int ret = -ETIMEDOUT;
+ __u8 data[4] = { phy, 0, 0, indx };

if (cmd & PHY_WRITE) {
__le16 *t = (__le16 *) & data[1];
@@ -207,12 +217,15 @@ static int __mii_op(pegasus_t *p, __u8 phy, __u8 indx, __u16 *regd, __u8 cmd)
if (data[0] & PHY_DONE)
break;
}
- if (i >= REG_TIMEOUT)
+ if (i >= REG_TIMEOUT) {
+ ret = -ETIMEDOUT;
goto fail;
+ }
if (cmd & PHY_READ) {
ret = get_registers(p, PhyData, 2, &regdi);
+ if (ret < 0)
+ goto fail;
*regd = le16_to_cpu(regdi);
- return ret;
}
return 0;
fail:
@@ -235,9 +248,13 @@ 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 +268,9 @@ 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 +278,25 @@ 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 +344,10 @@ 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 +387,21 @@ 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 +424,29 @@ 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 +464,16 @@ 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 +481,9 @@ 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)
@@ -1004,8 +1038,7 @@ 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))
@@ -1039,22 +1072,25 @@ 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);
+ if (ret < 0)
+ 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);
@@ -1066,7 +1102,9 @@ 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;
@@ -1081,6 +1119,10 @@ static inline void setup_pegasus_II(pegasus_t *pegasus)
set_register(pegasus, Reg81, 6);
else
set_register(pegasus, Reg81, 2);
+
+ return;
+fail:
+ netif_dbg(pegasus, drv, pegasus->net, "%s failed\n", __func__);
}

static void check_carrier(struct work_struct *work)
--
2.30.2