Revision a6f74333548f56afb413fc928ae1aefc4fe7608f authored by Dmytro Linkin on 25 August 2021, 14:51:26 UTC, committed by Saeed Mahameed on 20 October 2021, 17:42:49 UTC
Dan Carpenter report: The patch f47e04eb96e0: "net/mlx5: E-switch, Allow setting share/max tx rate limits of rate groups" from May 31, 2021, leads to the following Smatch static checker warning: drivers/net/ethernet/mellanox/mlx5/core/esw/qos.c:483 esw_qos_create_rate_group() warn: passing zero to 'ERR_PTR' If min rate normalization failed then error code may be overwritten to 0 if scheduling element destruction succeed. Ignore this value and always return initial one. Fixes: f47e04eb96e0 ("net/mlx5: E-switch, Allow setting share/max tx rate limits of rate groups") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
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metrics.c
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/types.h>
#include <net/ip.h>
#include <net/net_namespace.h>
#include <net/tcp.h>
static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
int fc_mx_len, u32 *metrics,
struct netlink_ext_ack *extack)
{
bool ecn_ca = false;
struct nlattr *nla;
int remaining;
if (!fc_mx)
return 0;
nla_for_each_attr(nla, fc_mx, fc_mx_len, remaining) {
int type = nla_type(nla);
u32 val;
if (!type)
continue;
if (type > RTAX_MAX) {
NL_SET_ERR_MSG(extack, "Invalid metric type");
return -EINVAL;
}
if (type == RTAX_CC_ALGO) {
char tmp[TCP_CA_NAME_MAX];
nla_strscpy(tmp, nla, sizeof(tmp));
val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
if (val == TCP_CA_UNSPEC) {
NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm");
return -EINVAL;
}
} else {
if (nla_len(nla) != sizeof(u32)) {
NL_SET_ERR_MSG_ATTR(extack, nla,
"Invalid attribute in metrics");
return -EINVAL;
}
val = nla_get_u32(nla);
}
if (type == RTAX_ADVMSS && val > 65535 - 40)
val = 65535 - 40;
if (type == RTAX_MTU && val > 65535 - 15)
val = 65535 - 15;
if (type == RTAX_HOPLIMIT && val > 255)
val = 255;
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) {
NL_SET_ERR_MSG(extack, "Unknown flag set in feature mask in metrics attribute");
return -EINVAL;
}
metrics[type - 1] = val;
}
if (ecn_ca)
metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
return 0;
}
struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
int fc_mx_len,
struct netlink_ext_ack *extack)
{
struct dst_metrics *fib_metrics;
int err;
if (!fc_mx)
return (struct dst_metrics *)&dst_default_metrics;
fib_metrics = kzalloc(sizeof(*fib_metrics), GFP_KERNEL);
if (unlikely(!fib_metrics))
return ERR_PTR(-ENOMEM);
err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics,
extack);
if (!err) {
refcount_set(&fib_metrics->refcnt, 1);
} else {
kfree(fib_metrics);
fib_metrics = ERR_PTR(err);
}
return fib_metrics;
}
EXPORT_SYMBOL_GPL(ip_fib_metrics_init);
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