2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/net.h b/include/linux/net.h
index b42bb60..4da9d57 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -199,6 +199,9 @@ struct proto_ops {
 				       struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 };
 
+#define DECLARE_SOCKADDR(type, dst, src)	\
+	type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
+
 struct net_proto_family {
 	int		family;
 	int		(*create)(struct net *net, struct socket *sock, int protocol);
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 59966f1..7b3aae2 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -24,6 +24,9 @@ struct __kernel_sockaddr_storage {
 #include <linux/types.h>		/* pid_t			*/
 #include <linux/compiler.h>		/* __user			*/
 
+#define __sockaddr_check_size(size)	\
+	BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
+
 #ifdef __KERNEL__
 # ifdef CONFIG_PROC_FS
 struct seq_file;