diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index c1a199c..ead22e5 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1027,7 +1027,7 @@
 
 	if (!err) {
 		buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
-		sz = skb_tail_pointer(buf) - buf_crs;
+		sz = (unsigned char *)msg + msg_size(msg) - buf_crs;
 
 		needed = (buf_len - sz_copied);
 		sz_to_copy = (sz <= needed) ? sz : needed;