1 files changed, 6 insertions, 44 deletions

diff --git a/net/x25/x25_dev.c b/net/x25/x25_dev.c
index 39231237e1c3..fb8ac1aa5826 100644
--- a/net/x25/x25_dev.c
+++ b/net/x25/x25_dev.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *	X.25 Packet Layer release 002
  *
@@ -6,12 +7,6 @@
  *
  *	This code REQUIRES 2.1.15 or higher
  *
- *	This module:
- *		This module is free software; you can redistribute it and/or
- *		modify it under the terms of the GNU General Public License
- *		as published by the Free Software Foundation; either version
- *		2 of the License, or (at your option) any later version.
- *
  *	History
  *	X.25 001	Jonathan Naylor	Started coding.
  *      2000-09-04	Henner Eisen	Prevent freeing a dangling skb.
@@ -60,7 +55,7 @@ static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb)
 		if (!sock_owned_by_user(sk)) {
 			queued = x25_process_rx_frame(sk, skb);
 		} else {
-			queued = !sk_add_backlog(sk, skb, sk->sk_rcvbuf);
+			queued = !sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf));
 		}
 		bh_unlock_sock(sk);
 		sock_put(sk);
@@ -120,8 +115,10 @@ int x25_lapb_receive_frame(struct sk_buff *skb, struct net_device *dev,
 		goto drop;
 	}
 
-	if (!pskb_may_pull(skb, 1))
-		return 0;
+	if (!pskb_may_pull(skb, 1)) {
+		x25_neigh_put(nb);
+		goto drop;
+	}
 
 	switch (skb->data[0]) {
 
@@ -163,10 +160,6 @@ void x25_establish_link(struct x25_neigh *nb)
 		*ptr = X25_IFACE_CONNECT;
 		break;
 
-#if IS_ENABLED(CONFIG_LLC)
-	case ARPHRD_ETHER:
-		return;
-#endif
 	default:
 		return;
 	}
@@ -177,32 +170,6 @@ void x25_establish_link(struct x25_neigh *nb)
 	dev_queue_xmit(skb);
 }
 
-void x25_terminate_link(struct x25_neigh *nb)
-{
-	struct sk_buff *skb;
-	unsigned char *ptr;
-
-#if IS_ENABLED(CONFIG_LLC)
-	if (nb->dev->type == ARPHRD_ETHER)
-		return;
-#endif
-	if (nb->dev->type != ARPHRD_X25)
-		return;
-
-	skb = alloc_skb(1, GFP_ATOMIC);
-	if (!skb) {
-		pr_err("x25_dev: out of memory\n");
-		return;
-	}
-
-	ptr  = skb_put(skb, 1);
-	*ptr = X25_IFACE_DISCONNECT;
-
-	skb->protocol = htons(ETH_P_X25);
-	skb->dev      = nb->dev;
-	dev_queue_xmit(skb);
-}
-
 void x25_send_frame(struct sk_buff *skb, struct x25_neigh *nb)
 {
 	unsigned char *dptr;
@@ -215,11 +182,6 @@ void x25_send_frame(struct sk_buff *skb, struct x25_neigh *nb)
 		*dptr = X25_IFACE_DATA;
 		break;
 
-#if IS_ENABLED(CONFIG_LLC)
-	case ARPHRD_ETHER:
-		kfree_skb(skb);
-		return;
-#endif
 	default:
 		kfree_skb(skb);
 		return;