From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 14 Dec 2006 23:51:44 +0000 (-0800)
Subject: [AX.25]: Fix unchecked rose_add_loopback_node uses
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a159aaa328a02b0189774c58ae7d917b25d26852;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[AX.25]: Fix unchecked rose_add_loopback_node uses

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/rose/rose_dev.c b/net/rose/rose_dev.c
index 7c279e2659ec..50824d345fa6 100644
--- a/net/rose/rose_dev.c
+++ b/net/rose/rose_dev.c
@@ -93,20 +93,34 @@ static int rose_rebuild_header(struct sk_buff *skb)
 static int rose_set_mac_address(struct net_device *dev, void *addr)
 {
 	struct sockaddr *sa = addr;
+	int err;
 
-	rose_del_loopback_node((rose_address *)dev->dev_addr);
+	if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len))
+		return 0;
 
-	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+	if (dev->flags & IFF_UP) {
+		err = rose_add_loopback_node((rose_address *)dev->dev_addr);
+		if (err)
+			return err;
+
+		rose_del_loopback_node((rose_address *)dev->dev_addr);
+	}
 
-	rose_add_loopback_node((rose_address *)dev->dev_addr);
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 
 	return 0;
 }
 
 static int rose_open(struct net_device *dev)
 {
+	int err;
+
+	err = rose_add_loopback_node((rose_address *)dev->dev_addr);
+	if (err)
+		return err;
+
 	netif_start_queue(dev);
-	rose_add_loopback_node((rose_address *)dev->dev_addr);
+
 	return 0;
 }