5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Xin Long <lucien.xin@xxxxxxxxx>
[ Upstream commit 3d3b2f57d4447e6e9f4096ad01d0e4129f7bc7e9 ]
Struct sctp_ep_common is included in both asoc and ep, but hlist_node
and hashent are only needed by ep after asoc_hashtable was dropped by
Commit b5eff7128366 ("sctp: drop the old assoc hashtable of sctp").
So it is better to move hlist_node and hashent from sctp_ep_common to
sctp_endpoint, and it saves some space for each asoc.
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 9ab0faa7f9ff ("sctp: Fix null-ptr-deref in reuseport_add_sock().")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/net/sctp/sctp.h | 4 ++--
include/net/sctp/structs.h | 8 ++++----
net/sctp/input.c | 27 ++++++++++-----------------
net/sctp/proc.c | 10 ++++------
net/sctp/socket.c | 6 +++---
5 files changed, 23 insertions(+), 32 deletions(-)
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 3ae61ce2eabd0..bf3716fe83e07 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -509,8 +509,8 @@ static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
}
-#define sctp_for_each_hentry(epb, head) \
- hlist_for_each_entry(epb, head, node)
+#define sctp_for_each_hentry(ep, head) \
+ hlist_for_each_entry(ep, head, node)
/* Is a socket of this style? */
#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 790252c1478b0..821b20a0f8829 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1244,10 +1244,6 @@ enum sctp_endpoint_type {
*/
struct sctp_ep_common {
- /* Fields to help us manage our entries in the hash tables. */
- struct hlist_node node;
- int hashent;
-
/* Runtime type information. What kind of endpoint is this? */
enum sctp_endpoint_type type;
@@ -1299,6 +1295,10 @@ struct sctp_endpoint {
/* Common substructure for endpoint and association. */
struct sctp_ep_common base;
+ /* Fields to help us manage our entries in the hash tables. */
+ struct hlist_node node;
+ int hashent;
+
/* Associations: A list of current associations and mappings
* to the data consumers for each association. This
* may be in the form of a hash table or other
diff --git a/net/sctp/input.c b/net/sctp/input.c
index d16b3885dcccb..4f43afa8678f9 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -748,23 +748,21 @@ static int __sctp_hash_endpoint(struct sctp_endpoint *ep)
struct sock *sk = ep->base.sk;
struct net *net = sock_net(sk);
struct sctp_hashbucket *head;
- struct sctp_ep_common *epb;
- epb = &ep->base;
- epb->hashent = sctp_ep_hashfn(net, epb->bind_addr.port);
- head = &sctp_ep_hashtable[epb->hashent];
+ ep->hashent = sctp_ep_hashfn(net, ep->base.bind_addr.port);
+ head = &sctp_ep_hashtable[ep->hashent];
if (sk->sk_reuseport) {
bool any = sctp_is_ep_boundall(sk);
- struct sctp_ep_common *epb2;
+ struct sctp_endpoint *ep2;
struct list_head *list;
int cnt = 0, err = 1;
list_for_each(list, &ep->base.bind_addr.address_list)
cnt++;
- sctp_for_each_hentry(epb2, &head->chain) {
- struct sock *sk2 = epb2->sk;
+ sctp_for_each_hentry(ep2, &head->chain) {
+ struct sock *sk2 = ep2->base.sk;
if (!net_eq(sock_net(sk2), net) || sk2 == sk ||
!uid_eq(sock_i_uid(sk2), sock_i_uid(sk)) ||
@@ -791,7 +789,7 @@ static int __sctp_hash_endpoint(struct sctp_endpoint *ep)
}
write_lock(&head->lock);
- hlist_add_head(&epb->node, &head->chain);
+ hlist_add_head(&ep->node, &head->chain);
write_unlock(&head->lock);
return 0;
}
@@ -813,19 +811,16 @@ static void __sctp_unhash_endpoint(struct sctp_endpoint *ep)
{
struct sock *sk = ep->base.sk;
struct sctp_hashbucket *head;
- struct sctp_ep_common *epb;
- epb = &ep->base;
+ ep->hashent = sctp_ep_hashfn(sock_net(sk), ep->base.bind_addr.port);
- epb->hashent = sctp_ep_hashfn(sock_net(sk), epb->bind_addr.port);
-
- head = &sctp_ep_hashtable[epb->hashent];
+ head = &sctp_ep_hashtable[ep->hashent];
if (rcu_access_pointer(sk->sk_reuseport_cb))
reuseport_detach_sock(sk);
write_lock(&head->lock);
- hlist_del_init(&epb->node);
+ hlist_del_init(&ep->node);
write_unlock(&head->lock);
}
@@ -858,7 +853,6 @@ static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(
const union sctp_addr *paddr)
{
struct sctp_hashbucket *head;
- struct sctp_ep_common *epb;
struct sctp_endpoint *ep;
struct sock *sk;
__be16 lport;
@@ -868,8 +862,7 @@ static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(
hash = sctp_ep_hashfn(net, ntohs(lport));
head = &sctp_ep_hashtable[hash];
read_lock(&head->lock);
- sctp_for_each_hentry(epb, &head->chain) {
- ep = sctp_ep(epb);
+ sctp_for_each_hentry(ep, &head->chain) {
if (sctp_endpoint_is_match(ep, net, laddr))
goto hit;
}
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index 963b94517ec20..ec00ee75d59a6 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -161,7 +161,6 @@ static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
static int sctp_eps_seq_show(struct seq_file *seq, void *v)
{
struct sctp_hashbucket *head;
- struct sctp_ep_common *epb;
struct sctp_endpoint *ep;
struct sock *sk;
int hash = *(loff_t *)v;
@@ -171,18 +170,17 @@ static int sctp_eps_seq_show(struct seq_file *seq, void *v)
head = &sctp_ep_hashtable[hash];
read_lock_bh(&head->lock);
- sctp_for_each_hentry(epb, &head->chain) {
- ep = sctp_ep(epb);
- sk = epb->sk;
+ sctp_for_each_hentry(ep, &head->chain) {
+ sk = ep->base.sk;
if (!net_eq(sock_net(sk), seq_file_net(seq)))
continue;
seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
sctp_sk(sk)->type, sk->sk_state, hash,
- epb->bind_addr.port,
+ ep->base.bind_addr.port,
from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
sock_i_ino(sk));
- sctp_seq_dump_local_addrs(seq, epb);
+ sctp_seq_dump_local_addrs(seq, &ep->base);
seq_printf(seq, "\n");
}
read_unlock_bh(&head->lock);
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 967b330ffd4e3..9fe13de66b272 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5303,14 +5303,14 @@ int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
void *p) {
int err = 0;
int hash = 0;
- struct sctp_ep_common *epb;
+ struct sctp_endpoint *ep;
struct sctp_hashbucket *head;
for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
hash++, head++) {
read_lock_bh(&head->lock);
- sctp_for_each_hentry(epb, &head->chain) {
- err = cb(sctp_ep(epb), p);
+ sctp_for_each_hentry(ep, &head->chain) {
+ err = cb(ep, p);
if (err)
break;
}
--
2.43.0
