diff --git a/net/rxrpc/proc.c b/net/rxrpc/proc.c
index 245418943e01..47d36554ad31 100644
--- a/net/rxrpc/proc.c
+++ b/net/rxrpc/proc.c
@@ -10,6 +10,10 @@
 #include <net/af_rxrpc.h>
 #include "ar-internal.h"
 
+#define RXRPC_PROC_ADDRBUF_SIZE \
+	(sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") + \
+	 sizeof(":12345"))
+
 static const char *const rxrpc_conn_states[RXRPC_CONN__NR_STATES] = {
 	[RXRPC_CONN_UNUSED]			= "Unused  ",
 	[RXRPC_CONN_CLIENT]			= "Client  ",
@@ -55,7 +59,7 @@ static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
 	unsigned long timeout = 0;
 	rxrpc_seq_t tx_hard_ack, rx_hard_ack;
-	char lbuff[50], rbuff[50];
+	char lbuff[RXRPC_PROC_ADDRBUF_SIZE], rbuff[RXRPC_PROC_ADDRBUF_SIZE];
 
 	if (v == &rxnet->calls) {
 		seq_puts(seq,
@@ -72,7 +76,7 @@ static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
 	if (rx) {
 		local = READ_ONCE(rx->local);
 		if (local)
-			sprintf(lbuff, "%pISpc", &local->srx.transport);
+			scnprintf(lbuff, sizeof(lbuff), "%pISpc", &local->srx.transport);
 		else
 			strcpy(lbuff, "no_local");
 	} else {
@@ -81,7 +85,7 @@ static int rxrpc_call_seq_show(struct seq_file *seq, void *v)
 
 	peer = call->peer;
 	if (peer)
-		sprintf(rbuff, "%pISpc", &peer->srx.transport);
+		scnprintf(rbuff, sizeof(rbuff), "%pISpc", &peer->srx.transport);
 	else
 		strcpy(rbuff, "no_connection");
 
@@ -152,7 +156,7 @@ static int rxrpc_connection_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_connection *conn;
 	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));
-	char lbuff[50], rbuff[50];
+	char lbuff[RXRPC_PROC_ADDRBUF_SIZE], rbuff[RXRPC_PROC_ADDRBUF_SIZE];
 
 	if (v == &rxnet->conn_proc_list) {
 		seq_puts(seq,
@@ -171,9 +175,9 @@ static int rxrpc_connection_seq_show(struct seq_file *seq, void *v)
 		goto print;
 	}
 
-	sprintf(lbuff, "%pISpc", &conn->params.local->srx.transport);
+	scnprintf(lbuff, sizeof(lbuff), "%pISpc", &conn->params.local->srx.transport);
 
-	sprintf(rbuff, "%pISpc", &conn->params.peer->srx.transport);
+	scnprintf(rbuff, sizeof(rbuff), "%pISpc", &conn->params.peer->srx.transport);
 print:
 	seq_printf(seq,
 		   "UDP   %-47.47s %-47.47s %4x %08x %s %3u"
@@ -210,7 +214,7 @@ static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_peer *peer;
 	time64_t now;
-	char lbuff[50], rbuff[50];
+	char lbuff[RXRPC_PROC_ADDRBUF_SIZE], rbuff[RXRPC_PROC_ADDRBUF_SIZE];
 
 	if (v == SEQ_START_TOKEN) {
 		seq_puts(seq,
@@ -223,9 +227,9 @@ static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)
 
 	peer = list_entry(v, struct rxrpc_peer, hash_link);
 
-	sprintf(lbuff, "%pISpc", &peer->local->srx.transport);
+	scnprintf(lbuff, sizeof(lbuff), "%pISpc", &peer->local->srx.transport);
 
-	sprintf(rbuff, "%pISpc", &peer->srx.transport);
+	scnprintf(rbuff, sizeof(rbuff), "%pISpc", &peer->srx.transport);
 
 	now = ktime_get_seconds();
 	seq_printf(seq,
@@ -335,7 +339,7 @@ const struct seq_operations rxrpc_peer_seq_ops = {
 static int rxrpc_local_seq_show(struct seq_file *seq, void *v)
 {
 	struct rxrpc_local *local;
-	char lbuff[50];
+	char lbuff[RXRPC_PROC_ADDRBUF_SIZE];
 
 	if (v == SEQ_START_TOKEN) {
 		seq_puts(seq,
@@ -346,7 +350,7 @@ static int rxrpc_local_seq_show(struct seq_file *seq, void *v)
 
 	local = hlist_entry(v, struct rxrpc_local, link);
 
-	sprintf(lbuff, "%pISpc", &local->srx.transport);
+	scnprintf(lbuff, sizeof(lbuff), "%pISpc", &local->srx.transport);
 
 	seq_printf(seq,
 		   "UDP   %-47.47s %3u %3u\n",