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Message-Id: <20240531154634.3891-1-kerneljasonxing@gmail.com>
Date: Fri, 31 May 2024 23:46:34 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
davem@...emloft.net,
dsahern@...nel.org
Cc: netdev@...r.kernel.org,
kerneljasonxing@...il.com,
Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next] net: remove NULL-pointer net parameter in ip_metrics_convert
From: Jason Xing <kernelxing@...cent.com>
When I was doing some experiments, I found that when using the first
parameter, namely, struct net, in ip_metrics_convert() always triggers NULL
pointer crash. Then I digged into this part, realizing that we can remove
this one due to its uselessness.
Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
include/net/ip.h | 3 +--
include/net/tcp.h | 2 +-
net/ipv4/fib_semantics.c | 5 ++---
net/ipv4/metrics.c | 8 ++++----
net/ipv4/tcp_cong.c | 11 +++++------
net/ipv6/route.c | 2 +-
6 files changed, 14 insertions(+), 17 deletions(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index 6d735e00d3f3..c5606cadb1a5 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -506,8 +506,7 @@ static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);
}
-struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
- int fc_mx_len,
+struct dst_metrics *ip_fib_metrics_init(struct nlattr *fc_mx, int fc_mx_len,
struct netlink_ext_ack *extack);
static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
{
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 32815a40dea1..45bbb54e42e8 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1216,7 +1216,7 @@ extern struct tcp_congestion_ops tcp_reno;
struct tcp_congestion_ops *tcp_ca_find(const char *name);
struct tcp_congestion_ops *tcp_ca_find_key(u32 key);
-u32 tcp_ca_get_key_by_name(struct net *net, const char *name, bool *ecn_ca);
+u32 tcp_ca_get_key_by_name(const char *name, bool *ecn_ca);
#ifdef CONFIG_INET
char *tcp_ca_get_name_by_key(u32 key, char *buffer);
#else
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index f669da98d11d..7b6b042208bd 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -1030,7 +1030,7 @@ bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi)
bool ecn_ca = false;
nla_strscpy(tmp, nla, sizeof(tmp));
- val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca);
+ val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
} else {
if (nla_len(nla) != sizeof(u32))
return false;
@@ -1459,8 +1459,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL);
if (!fi)
goto failure;
- fi->fib_metrics = ip_fib_metrics_init(fi->fib_net, cfg->fc_mx,
- cfg->fc_mx_len, extack);
+ fi->fib_metrics = ip_fib_metrics_init(cfg->fc_mx, cfg->fc_mx_len, extack);
if (IS_ERR(fi->fib_metrics)) {
err = PTR_ERR(fi->fib_metrics);
kfree(fi);
diff --git a/net/ipv4/metrics.c b/net/ipv4/metrics.c
index 0e3ee1532848..8ddac1f595ed 100644
--- a/net/ipv4/metrics.c
+++ b/net/ipv4/metrics.c
@@ -7,7 +7,7 @@
#include <net/net_namespace.h>
#include <net/tcp.h>
-static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
+static int ip_metrics_convert(struct nlattr *fc_mx,
int fc_mx_len, u32 *metrics,
struct netlink_ext_ack *extack)
{
@@ -31,7 +31,7 @@ static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
char tmp[TCP_CA_NAME_MAX];
nla_strscpy(tmp, nla, sizeof(tmp));
- val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
+ val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
if (val == TCP_CA_UNSPEC) {
NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm");
return -EINVAL;
@@ -63,7 +63,7 @@ static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
return 0;
}
-struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
+struct dst_metrics *ip_fib_metrics_init(struct nlattr *fc_mx,
int fc_mx_len,
struct netlink_ext_ack *extack)
{
@@ -77,7 +77,7 @@ struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
if (unlikely(!fib_metrics))
return ERR_PTR(-ENOMEM);
- err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics,
+ err = ip_metrics_convert(fc_mx, fc_mx_len, fib_metrics->metrics,
extack);
if (!err) {
refcount_set(&fib_metrics->refcnt, 1);
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 28ffcfbeef14..48617d99abb0 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -46,8 +46,7 @@ void tcp_set_ca_state(struct sock *sk, const u8 ca_state)
}
/* Must be called with rcu lock held */
-static struct tcp_congestion_ops *tcp_ca_find_autoload(struct net *net,
- const char *name)
+static struct tcp_congestion_ops *tcp_ca_find_autoload(const char *name)
{
struct tcp_congestion_ops *ca = tcp_ca_find(name);
@@ -178,7 +177,7 @@ int tcp_update_congestion_control(struct tcp_congestion_ops *ca, struct tcp_cong
return ret;
}
-u32 tcp_ca_get_key_by_name(struct net *net, const char *name, bool *ecn_ca)
+u32 tcp_ca_get_key_by_name(const char *name, bool *ecn_ca)
{
const struct tcp_congestion_ops *ca;
u32 key = TCP_CA_UNSPEC;
@@ -186,7 +185,7 @@ u32 tcp_ca_get_key_by_name(struct net *net, const char *name, bool *ecn_ca)
might_sleep();
rcu_read_lock();
- ca = tcp_ca_find_autoload(net, name);
+ ca = tcp_ca_find_autoload(name);
if (ca) {
key = ca->key;
*ecn_ca = ca->flags & TCP_CONG_NEEDS_ECN;
@@ -283,7 +282,7 @@ int tcp_set_default_congestion_control(struct net *net, const char *name)
int ret;
rcu_read_lock();
- ca = tcp_ca_find_autoload(net, name);
+ ca = tcp_ca_find_autoload(name);
if (!ca) {
ret = -ENOENT;
} else if (!bpf_try_module_get(ca, ca->owner)) {
@@ -421,7 +420,7 @@ int tcp_set_congestion_control(struct sock *sk, const char *name, bool load,
if (!load)
ca = tcp_ca_find(name);
else
- ca = tcp_ca_find_autoload(sock_net(sk), name);
+ ca = tcp_ca_find_autoload(name);
/* No change asking for existing value */
if (ca == icsk->icsk_ca_ops) {
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index bbc2a0dd9314..d3dce7ee4741 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3760,7 +3760,7 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
if (!rt)
goto out;
- rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
+ rt->fib6_metrics = ip_fib_metrics_init(cfg->fc_mx, cfg->fc_mx_len,
extack);
if (IS_ERR(rt->fib6_metrics)) {
err = PTR_ERR(rt->fib6_metrics);
--
2.37.3
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