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Date: Sat, 9 Jan 2021 19:26:20 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Stephen Hemminger <stephen@...workplumber.org>,
Eric Dumazet <edumazet@...gle.com>,
George McCollister <george.mccollister@...il.com>,
Oleksij Rempel <o.rempel@...gutronix.de>,
Jay Vosburgh <j.vosburgh@...il.com>,
Veaceslav Falico <vfalico@...il.com>,
Andy Gospodarek <andy@...yhouse.net>,
Arnd Bergmann <arnd@...db.de>, Taehee Yoo <ap420073@...il.com>,
Jiri Pirko <jiri@...nulli.us>, Florian Westphal <fw@...len.de>,
Nikolay Aleksandrov <nikolay@...dia.com>,
Pravin B Shelar <pshelar@....org>,
Sridhar Samudrala <sridhar.samudrala@...el.com>,
Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH v6 net-next 11/15] net: catch errors from dev_get_stats
From: Vladimir Oltean <vladimir.oltean@....com>
dev_get_stats can now return error codes. Convert all remaining call
sites to look at that error code and stop processing.
The effects of simulating a kernel error (returning -ENOMEM) upon
existing programs or kernel interfaces:
- ifconfig and "cat /proc/net/dev" print up until the interface that
failed, and there they return:
cat: read error: Cannot allocate memory
- ifstat and "ip -s -s link show":
RTNETLINK answers: Cannot allocate memory
Dump terminated
Some call sites are coming from a context that returns void (ethtool
stats, workqueue context). So since we can't report to the upper layer,
do the next best thing: print an error to the console.
This patch wraps up the conversion of existing dev_get_stats callers, so
we can add the __must_check attribute now to ensure that future callers
keep doing this too.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v6:
- Fixed rtnetlink incorrectly returning 0 in rtnl_fill_ifinfo on
nla_put_failure and causing "ip a" to not show any interfaces.
- Squashed the patch to propagate errors with the one to terminate them.
Changes in v5:
- Actually propagate errors from bonding and net_failover from within
this patch.
- Properly propagating the dev_get_stats() error code from
rtnl_fill_stats now, and not -EMSGSIZE.
Changes in v4:
Patch is new (Eric's suggestion).
arch/s390/appldata/appldata_net_sum.c | 10 ++++--
drivers/leds/trigger/ledtrig-netdev.c | 9 ++++-
drivers/net/bonding/bond_main.c | 29 ++++++++++++----
.../ethernet/apm/xgene/xgene_enet_ethtool.c | 9 +++--
.../net/ethernet/hisilicon/hns/hns_ethtool.c | 7 +++-
drivers/net/ethernet/intel/e1000e/ethtool.c | 9 +++--
.../net/ethernet/intel/ixgbe/ixgbe_ethtool.c | 9 +++--
drivers/net/ethernet/intel/ixgbevf/ethtool.c | 9 +++--
drivers/net/net_failover.c | 33 ++++++++++++++-----
drivers/parisc/led.c | 7 +++-
drivers/usb/gadget/function/rndis.c | 4 ++-
include/linux/netdevice.h | 3 +-
net/8021q/vlanproc.c | 7 ++--
net/core/dev.c | 3 +-
net/core/net-procfs.c | 16 ++++++---
net/core/net-sysfs.c | 4 ++-
net/core/rtnetlink.c | 23 +++++++++----
17 files changed, 147 insertions(+), 44 deletions(-)
diff --git a/arch/s390/appldata/appldata_net_sum.c b/arch/s390/appldata/appldata_net_sum.c
index 6146606ac9a3..72cb5344e488 100644
--- a/arch/s390/appldata/appldata_net_sum.c
+++ b/arch/s390/appldata/appldata_net_sum.c
@@ -58,11 +58,11 @@ struct appldata_net_sum_data {
*/
static void appldata_get_net_sum_data(void *data)
{
- int i;
struct appldata_net_sum_data *net_data;
struct net_device *dev;
unsigned long rx_packets, tx_packets, rx_bytes, tx_bytes, rx_errors,
tx_errors, rx_dropped, tx_dropped, collisions;
+ int ret, i;
net_data = data;
net_data->sync_count_1++;
@@ -83,7 +83,13 @@ static void appldata_get_net_sum_data(void *data)
for_each_netdev(&init_net, dev) {
struct rtnl_link_stats64 stats;
- dev_get_stats(dev, &stats);
+ ret = dev_get_stats(dev, &stats);
+ if (ret) {
+ netif_lists_unlock(&init_net);
+ netdev_err(dev, "dev_get_stats returned %d\n", ret);
+ return;
+ }
+
rx_packets += stats.rx_packets;
tx_packets += stats.tx_packets;
rx_bytes += stats.rx_bytes;
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 4382ee278309..c717b7e7dd81 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -351,6 +351,7 @@ static void netdev_trig_work(struct work_struct *work)
unsigned int new_activity;
unsigned long interval;
int invert;
+ int err;
/* If we dont have a device, insure we are off */
if (!trigger_data->net_dev) {
@@ -363,7 +364,13 @@ static void netdev_trig_work(struct work_struct *work)
!test_bit(NETDEV_LED_RX, &trigger_data->mode))
return;
- dev_get_stats(trigger_data->net_dev, &dev_stats);
+ err = dev_get_stats(trigger_data->net_dev, &dev_stats);
+ if (err) {
+ netdev_err(trigger_data->net_dev,
+ "dev_get_stats returned %d\n", err);
+ return;
+ }
+
new_activity =
(test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
dev_stats.tx_packets : 0) +
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 17faf431d85b..b70ca0e41142 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1757,7 +1757,12 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev,
slave_dev->priv_flags |= IFF_BONDING;
/* initialize slave stats */
- dev_get_stats(new_slave->dev, &new_slave->slave_stats);
+ res = dev_get_stats(new_slave->dev, &new_slave->slave_stats);
+ if (res) {
+ slave_err(bond_dev, slave_dev, "dev_get_stats returned %d\n",
+ res);
+ goto err_close;
+ }
if (bond_is_lb(bond)) {
/* bond_alb_init_slave() must be called before all other stages since
@@ -2070,6 +2075,7 @@ static int __bond_release_one(struct net_device *bond_dev,
struct sockaddr_storage ss;
int old_flags = bond_dev->flags;
netdev_features_t old_features = bond_dev->features;
+ int err;
/* slave is not a slave or master is not master of this slave */
if (!(slave_dev->flags & IFF_SLAVE) ||
@@ -2088,13 +2094,19 @@ static int __bond_release_one(struct net_device *bond_dev,
return -EINVAL;
}
+ /* recompute stats just before removing the slave */
+ err = bond_get_stats(bond->dev, &bond->bond_stats);
+ if (err) {
+ slave_info(bond_dev, slave_dev, "dev_get_stats returned %d\n",
+ err);
+ unblock_netpoll_tx();
+ return err;
+ }
+
bond_set_slave_inactive_flags(slave, BOND_SLAVE_NOTIFY_NOW);
bond_sysfs_slave_del(slave);
- /* recompute stats just before removing the slave */
- bond_get_stats(bond->dev, &bond->bond_stats);
-
bond_upper_dev_unlink(bond, slave);
/* unregister rx_handler early so bond_handle_frame wouldn't be called
* for this slave anymore.
@@ -3742,7 +3754,7 @@ static int bond_get_stats(struct net_device *bond_dev,
struct list_head *iter;
struct slave *slave;
int nest_level = 0;
-
+ int res = 0;
rcu_read_lock();
#ifdef CONFIG_LOCKDEP
@@ -3753,7 +3765,9 @@ static int bond_get_stats(struct net_device *bond_dev,
memcpy(stats, &bond->bond_stats, sizeof(*stats));
bond_for_each_slave_rcu(bond, slave, iter) {
- dev_get_stats(slave->dev, &temp);
+ res = dev_get_stats(slave->dev, &temp);
+ if (res)
+ goto out;
bond_fold_stats(stats, &temp, &slave->slave_stats);
@@ -3762,10 +3776,11 @@ static int bond_get_stats(struct net_device *bond_dev,
}
memcpy(&bond->bond_stats, stats, sizeof(*stats));
+out:
spin_unlock(&bond->stats_lock);
rcu_read_unlock();
- return 0;
+ return res;
}
static int bond_do_ioctl(struct net_device *bond_dev, struct ifreq *ifr, int cmd)
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_ethtool.c b/drivers/net/ethernet/apm/xgene/xgene_enet_ethtool.c
index ada70425b48c..aab6a81f0438 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_ethtool.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_ethtool.c
@@ -266,9 +266,14 @@ static void xgene_get_ethtool_stats(struct net_device *ndev,
{
struct xgene_enet_pdata *pdata = netdev_priv(ndev);
struct rtnl_link_stats64 stats;
- int i;
+ int err, i;
+
+ err = dev_get_stats(ndev, &stats);
+ if (err) {
+ netdev_err(ndev, "dev_get_stats returned %d\n", err);
+ return;
+ }
- dev_get_stats(ndev, &stats);
for (i = 0; i < XGENE_STATS_LEN; i++)
data[i] = *(u64 *)((char *)&stats + gstrings_stats[i].offset);
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index ee2172011051..d05fa7b3f6e0 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -840,6 +840,7 @@ static void hns_get_ethtool_stats(struct net_device *netdev,
struct hns_nic_priv *priv = netdev_priv(netdev);
struct hnae_handle *h = priv->ae_handle;
struct rtnl_link_stats64 net_stats;
+ int err;
if (!h->dev->ops->get_stats || !h->dev->ops->update_stats) {
netdev_err(netdev, "get_stats or update_stats is null!\n");
@@ -848,7 +849,11 @@ static void hns_get_ethtool_stats(struct net_device *netdev,
h->dev->ops->update_stats(h, &netdev->stats);
- dev_get_stats(netdev, &net_stats);
+ err = dev_get_stats(netdev, &net_stats);
+ if (err) {
+ netdev_err(netdev, "dev_get_stats returned %d\n", err);
+ return;
+ }
/* get netdev statistics */
p[0] = net_stats.rx_packets;
diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 06442e6bef73..41bd3e0598ce 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -2060,15 +2060,20 @@ static void e1000_get_ethtool_stats(struct net_device *netdev,
{
struct e1000_adapter *adapter = netdev_priv(netdev);
struct rtnl_link_stats64 net_stats;
- int i;
char *p = NULL;
+ int err, i;
pm_runtime_get_sync(netdev->dev.parent);
- dev_get_stats(netdev, &net_stats);
+ err = dev_get_stats(netdev, &net_stats);
pm_runtime_put_sync(netdev->dev.parent);
+ if (err) {
+ netdev_err(netdev, "dev_get_stats returned %d\n", err);
+ return;
+ }
+
for (i = 0; i < E1000_GLOBAL_STATS_LEN; i++) {
switch (e1000_gstrings_stats[i].type) {
case NETDEV_STATS:
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index 2b8084664403..a647e2774f76 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -1298,11 +1298,16 @@ static void ixgbe_get_ethtool_stats(struct net_device *netdev,
struct rtnl_link_stats64 net_stats;
unsigned int start;
struct ixgbe_ring *ring;
- int i, j;
char *p = NULL;
+ int err, i, j;
ixgbe_update_stats(adapter);
- dev_get_stats(netdev, &net_stats);
+ err = dev_get_stats(netdev, &net_stats);
+ if (err) {
+ netdev_err(netdev, "dev_get_stats returned %d\n", err);
+ return;
+ }
+
for (i = 0; i < IXGBE_GLOBAL_STATS_LEN; i++) {
switch (ixgbe_gstrings_stats[i].type) {
case NETDEV_STATS:
diff --git a/drivers/net/ethernet/intel/ixgbevf/ethtool.c b/drivers/net/ethernet/intel/ixgbevf/ethtool.c
index 3b9b7e5c2998..665e39301092 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ethtool.c
@@ -423,11 +423,16 @@ static void ixgbevf_get_ethtool_stats(struct net_device *netdev,
struct rtnl_link_stats64 net_stats;
unsigned int start;
struct ixgbevf_ring *ring;
- int i, j;
+ int err, i, j;
char *p;
ixgbevf_update_stats(adapter);
- dev_get_stats(netdev, &net_stats);
+ err = dev_get_stats(netdev, &net_stats);
+ if (err) {
+ netdev_err(netdev, "dev_get_stats returned %d\n", err);
+ return;
+ }
+
for (i = 0; i < IXGBEVF_GLOBAL_STATS_LEN; i++) {
switch (ixgbevf_gstrings_stats[i].type) {
case NETDEV_STATS:
diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c
index e032ad1c5e22..2815228a34d5 100644
--- a/drivers/net/net_failover.c
+++ b/drivers/net/net_failover.c
@@ -185,6 +185,7 @@ static int net_failover_get_stats(struct net_device *dev,
struct net_failover_info *nfo_info = netdev_priv(dev);
struct rtnl_link_stats64 temp;
struct net_device *slave_dev;
+ int err = 0;
spin_lock(&nfo_info->stats_lock);
memcpy(stats, &nfo_info->failover_stats, sizeof(*stats));
@@ -193,24 +194,29 @@ static int net_failover_get_stats(struct net_device *dev,
slave_dev = rcu_dereference(nfo_info->primary_dev);
if (slave_dev) {
- dev_get_stats(slave_dev, &temp);
+ err = dev_get_stats(slave_dev, &temp);
+ if (err)
+ goto out;
net_failover_fold_stats(stats, &temp, &nfo_info->primary_stats);
memcpy(&nfo_info->primary_stats, &temp, sizeof(temp));
}
slave_dev = rcu_dereference(nfo_info->standby_dev);
if (slave_dev) {
- dev_get_stats(slave_dev, &temp);
+ err = dev_get_stats(slave_dev, &temp);
+ if (err)
+ goto out;
net_failover_fold_stats(stats, &temp, &nfo_info->standby_stats);
memcpy(&nfo_info->standby_stats, &temp, sizeof(temp));
}
+out:
rcu_read_unlock();
memcpy(&nfo_info->failover_stats, stats, sizeof(*stats));
spin_unlock(&nfo_info->stats_lock);
- return 0;
+ return err;
}
static int net_failover_change_mtu(struct net_device *dev, int new_mtu)
@@ -545,11 +551,15 @@ static int net_failover_slave_register(struct net_device *slave_dev,
if (slave_is_standby) {
rcu_assign_pointer(nfo_info->standby_dev, slave_dev);
standby_dev = slave_dev;
- dev_get_stats(standby_dev, &nfo_info->standby_stats);
+ err = dev_get_stats(standby_dev, &nfo_info->standby_stats);
+ if (err)
+ goto err_stats_get;
} else {
rcu_assign_pointer(nfo_info->primary_dev, slave_dev);
primary_dev = slave_dev;
- dev_get_stats(primary_dev, &nfo_info->primary_stats);
+ err = dev_get_stats(primary_dev, &nfo_info->primary_stats);
+ if (err)
+ goto err_stats_get;
failover_dev->min_mtu = slave_dev->min_mtu;
failover_dev->max_mtu = slave_dev->max_mtu;
}
@@ -564,6 +574,8 @@ static int net_failover_slave_register(struct net_device *slave_dev,
return 0;
+err_stats_get:
+ vlan_vids_del_by_dev(slave_dev, failover_dev);
err_vlan_add:
dev_uc_unsync(slave_dev, failover_dev);
dev_mc_unsync(slave_dev, failover_dev);
@@ -597,6 +609,7 @@ static int net_failover_slave_unregister(struct net_device *slave_dev,
struct net_device *standby_dev, *primary_dev;
struct net_failover_info *nfo_info;
bool slave_is_standby;
+ int err;
nfo_info = netdev_priv(failover_dev);
primary_dev = rtnl_dereference(nfo_info->primary_dev);
@@ -611,7 +624,8 @@ static int net_failover_slave_unregister(struct net_device *slave_dev,
dev_close(slave_dev);
nfo_info = netdev_priv(failover_dev);
- dev_get_stats(failover_dev, &nfo_info->failover_stats);
+ /* Proceed with the deregistration anyway */
+ err = dev_get_stats(failover_dev, &nfo_info->failover_stats);
slave_is_standby = slave_dev->dev.parent == failover_dev->dev.parent;
if (slave_is_standby) {
@@ -631,7 +645,7 @@ static int net_failover_slave_unregister(struct net_device *slave_dev,
netdev_info(failover_dev, "failover %s slave:%s unregistered\n",
slave_is_standby ? "standby" : "primary", slave_dev->name);
- return 0;
+ return err;
}
static int net_failover_slave_link_change(struct net_device *slave_dev,
@@ -639,6 +653,7 @@ static int net_failover_slave_link_change(struct net_device *slave_dev,
{
struct net_device *primary_dev, *standby_dev;
struct net_failover_info *nfo_info;
+ int err;
nfo_info = netdev_priv(failover_dev);
@@ -653,7 +668,9 @@ static int net_failover_slave_link_change(struct net_device *slave_dev,
netif_carrier_on(failover_dev);
netif_tx_wake_all_queues(failover_dev);
} else {
- dev_get_stats(failover_dev, &nfo_info->failover_stats);
+ err = dev_get_stats(failover_dev, &nfo_info->failover_stats);
+ if (err)
+ return err;
netif_carrier_off(failover_dev);
netif_tx_stop_all_queues(failover_dev);
}
diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c
index cc6108785323..d17d0fbf878d 100644
--- a/drivers/parisc/led.c
+++ b/drivers/parisc/led.c
@@ -370,7 +370,12 @@ static __inline__ int led_get_net_activity(void)
in_dev_put(in_dev);
- dev_get_stats(dev, &stats);
+ retval = dev_get_stats(dev, &stats);
+ if (retval) {
+ netif_lists_unlock(&init_net);
+ return retval;
+ }
+
rx_total += stats.rx_packets;
tx_total += stats.tx_packets;
}
diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index 7ec29e007ae9..bec474819c3d 100644
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -198,7 +198,9 @@ static int gen_ndis_query_resp(struct rndis_params *params, u32 OID, u8 *buf,
resp->InformationBufferOffset = cpu_to_le32(16);
net = params->dev;
- dev_get_stats(net, &stats);
+ retval = dev_get_stats(net, &stats);
+ if (retval)
+ return retval;
switch (OID) {
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index bd471f1e1fa3..b1aebab916a8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -4545,7 +4545,8 @@ void netdev_notify_peers(struct net_device *dev);
void netdev_features_change(struct net_device *dev);
/* Load a device via the kmod */
void dev_load(struct net *net, const char *name);
-int dev_get_stats(struct net_device *dev, struct rtnl_link_stats64 *storage);
+int __must_check dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage);
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
const struct net_device_stats *netdev_stats);
void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s,
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
index 3a6682d79630..d89b75804834 100644
--- a/net/8021q/vlanproc.c
+++ b/net/8021q/vlanproc.c
@@ -244,12 +244,15 @@ static int vlandev_seq_show(struct seq_file *seq, void *offset)
const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
static const char fmt64[] = "%30s %12llu\n";
struct rtnl_link_stats64 stats;
- int i;
+ int err, i;
if (!is_vlan_dev(vlandev))
return 0;
- dev_get_stats(vlandev, &stats);
+ err = dev_get_stats(vlandev, &stats);
+ if (err)
+ return err;
+
seq_printf(seq,
"%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n",
vlandev->name, vlan->vlan_id,
diff --git a/net/core/dev.c b/net/core/dev.c
index dfbd66ba3cad..30facac95d5e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -10403,7 +10403,8 @@ EXPORT_SYMBOL(netdev_stats_to_stats64);
* dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
* otherwise the internal statistics structure is used.
*/
-int dev_get_stats(struct net_device *dev, struct rtnl_link_stats64 *storage)
+int __must_check dev_get_stats(struct net_device *dev,
+ struct rtnl_link_stats64 *storage)
{
const struct net_device_ops *ops = dev->netdev_ops;
int err = 0;
diff --git a/net/core/net-procfs.c b/net/core/net-procfs.c
index 64666ba7ccab..ee19c35f6e00 100644
--- a/net/core/net-procfs.c
+++ b/net/core/net-procfs.c
@@ -78,11 +78,14 @@ static void dev_seq_stop(struct seq_file *seq, void *v)
netif_lists_unlock(net);
}
-static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
+static int dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
struct rtnl_link_stats64 stats;
+ int err;
- dev_get_stats(dev, &stats);
+ err = dev_get_stats(dev, &stats);
+ if (err)
+ return err;
seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
@@ -101,6 +104,8 @@ static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
stats.tx_window_errors +
stats.tx_heartbeat_errors,
stats.tx_compressed);
+
+ return 0;
}
/*
@@ -109,6 +114,8 @@ static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
*/
static int dev_seq_show(struct seq_file *seq, void *v)
{
+ int err = 0;
+
if (v == SEQ_START_TOKEN)
seq_puts(seq, "Inter-| Receive "
" | Transmit\n"
@@ -116,8 +123,9 @@ static int dev_seq_show(struct seq_file *seq, void *v)
"compressed multicast|bytes packets errs "
"drop fifo colls carrier compressed\n");
else
- dev_seq_printf_stats(seq, v);
- return 0;
+ err = dev_seq_printf_stats(seq, v);
+
+ return err;
}
static u32 softnet_backlog_len(struct softnet_data *sd)
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 5d89c85b42d4..6f789e178e92 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -588,7 +588,9 @@ static ssize_t netstat_show(const struct device *d,
if (dev_isalive(dev)) {
struct rtnl_link_stats64 stats;
- dev_get_stats(dev, &stats);
+ ret = dev_get_stats(dev, &stats);
+ if (ret)
+ return ret;
ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)&stats) + offset));
}
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index bb0596c41b3e..6cc87094924d 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1201,6 +1201,7 @@ static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
{
struct rtnl_link_stats64 *sp;
struct nlattr *attr;
+ int err;
attr = nla_reserve_64bit(skb, IFLA_STATS64,
sizeof(struct rtnl_link_stats64), IFLA_PAD);
@@ -1208,7 +1209,9 @@ static noinline_for_stack int rtnl_fill_stats(struct sk_buff *skb,
return -EMSGSIZE;
sp = nla_data(attr);
- dev_get_stats(dev, sp);
+ err = dev_get_stats(dev, sp);
+ if (err)
+ return err;
attr = nla_reserve(skb, IFLA_STATS,
sizeof(struct rtnl_link_stats));
@@ -1707,6 +1710,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
{
struct ifinfomsg *ifm;
struct nlmsghdr *nlh;
+ int err;
ASSERT_RTNL();
nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ifm), flags);
@@ -1780,8 +1784,9 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
if (rtnl_phys_switch_id_fill(skb, dev))
goto nla_put_failure;
- if (rtnl_fill_stats(skb, dev))
- goto nla_put_failure;
+ err = rtnl_fill_stats(skb, dev);
+ if (err)
+ goto get_stats_failure;
if (rtnl_fill_vf(skb, dev, ext_filter_mask))
goto nla_put_failure;
@@ -1825,8 +1830,10 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
nla_put_failure_rcu:
rcu_read_unlock();
nla_put_failure:
+ err = -EMSGSIZE;
+get_stats_failure:
nlmsg_cancel(skb, nlh);
- return -EMSGSIZE;
+ return err;
}
static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
@@ -5135,7 +5142,9 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
goto nla_put_failure;
sp = nla_data(attr);
- dev_get_stats(dev, sp);
+ err = dev_get_stats(dev, sp);
+ if (err)
+ goto get_stats_failure;
}
if (stats_attr_valid(filter_mask, IFLA_STATS_LINK_XSTATS, *idxattr)) {
@@ -5242,13 +5251,15 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev,
return 0;
nla_put_failure:
+ err = -EMSGSIZE;
+get_stats_failure:
/* not a multi message or no progress mean a real error */
if (!(flags & NLM_F_MULTI) || s_prividx == *prividx)
nlmsg_cancel(skb, nlh);
else
nlmsg_end(skb, nlh);
- return -EMSGSIZE;
+ return err;
}
static size_t if_nlmsg_stats_size(const struct net_device *dev,
--
2.25.1
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