Code:  static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
 {
	struct rtnl_link_ifmap map = {
		.mem_start   = dev->mem_start,
		.mem_end     = dev->mem_end,
		.base_addr   = dev->base_addr,
		.irq         = dev->irq,
		.dma         = dev->dma,
		.port        = dev->if_port,
	};
 	if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
 		return -EMSGSIZE;
 
	return 0;
}

Commit Message: net: fix infoleak in rtnetlink

The stack object “map” has a total size of 32 bytes. Its last 4
bytes are padding generated by compiler. These padding bytes are
not initialized and sent out via “nla_put”.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
CWE ID: CWE-200
 static int rtnl_fill_link_ifmap(struct sk_buff *skb, struct net_device *dev)
 {
	struct rtnl_link_ifmap map;

	memset(&map, 0, sizeof(map));
	map.mem_start   = dev->mem_start;
	map.mem_end     = dev->mem_end;
	map.base_addr   = dev->base_addr;
	map.irq         = dev->irq;
	map.dma         = dev->dma;
	map.port        = dev->if_port;

 	if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
 		return -EMSGSIZE;
 
	return 0;
}
