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ksmbd: limit repeated connections from clients with the same IP

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commit e6bb9193974059ddbb0ce7763fa3882bd60d4dc3 upstream.

Repeated connections from clients with the same IP address may exhaust
the max connections and prevent other normal client connections.
This patch limit repeated connections from clients with the same IP.

Reported-by: tianshuo han <hantianshuo233@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon
2025-08-05 18:13:13 +09:00
committed by Greg Kroah-Hartman
parent 62d136d306
commit fa1c47af4f
2 changed files with 18 additions and 0 deletions
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1
fs/smb/server/connection.h
View File

@@ -45,6 +45,7 @@ struct ksmbd_conn {
struct mutex srv_mutex;
int status;
unsigned int cli_cap;
__be32 inet_addr;
char *request_buf;
struct ksmbd_transport *transport;
struct nls_table *local_nls;

17
fs/smb/server/transport_tcp.c
View File

@@ -87,6 +87,7 @@ static struct tcp_transport *alloc_transport(struct socket *client_sk)
return NULL;
}
conn->inet_addr = inet_sk(client_sk->sk)->inet_daddr;
conn->transport = KSMBD_TRANS(t);
KSMBD_TRANS(t)->conn = conn;
KSMBD_TRANS(t)->ops = &ksmbd_tcp_transport_ops;
@@ -230,6 +231,8 @@ static int ksmbd_kthread_fn(void *p)
{
struct socket *client_sk = NULL;
struct interface *iface = (struct interface *)p;
struct inet_sock *csk_inet;
struct ksmbd_conn *conn;
int ret;
while (!kthread_should_stop()) {
@@ -248,6 +251,20 @@ static int ksmbd_kthread_fn(void *p)
continue;
}
/*
* Limits repeated connections from clients with the same IP.
*/
csk_inet = inet_sk(client_sk->sk);
down_read(&conn_list_lock);
list_for_each_entry(conn, &conn_list, conns_list)
if (csk_inet->inet_daddr == conn->inet_addr) {
ret = -EAGAIN;
break;
}
up_read(&conn_list_lock);
if (ret == -EAGAIN)
continue;
if (server_conf.max_connections &&
atomic_inc_return(&active_num_conn) >= server_conf.max_connections) {
pr_info_ratelimited("Limit the maximum number of connections(%u)\n",