tipc: Removing deprecated strncpy()

This patch suggests the replacement of strncpy with strscpy
as per Documentation/process/deprecated.
The strncpy() fails to guarantee NULL termination,
The function adds zero pads which isn't really convenient for short strings
as it may cause performance issues.

strscpy() is a preferred replacement because
it overcomes the limitations of strncpy mentioned above.

Compile Tested

Signed-off-by: Kevin Paul Reddy Janagari <[email protected]>
Reviewed-by: Tung Nguyen <[email protected]>
Tested-by: Tung Nguyen <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: kevinpaul468

net/tipc/link.c

@@ -2228,7 +2228,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 			break;
 		if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
 			break;
-		strncpy(if_name, data, TIPC_MAX_IF_NAME);
+		strscpy(if_name, data, TIPC_MAX_IF_NAME);
 
 		/* Update own tolerance if peer indicates a non-zero value */
 		if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) {

net/tipc/node.c

@@ -1581,7 +1581,7 @@ int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
 	tipc_node_read_lock(node);
 	link = node->links[bearer_id].link;
 	if (link) {
-		strncpy(linkname, tipc_link_name(link), len);
+		strscpy(linkname, tipc_link_name(link), len);
 		err = 0;
 	}
 	tipc_node_read_unlock(node);