diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c
index 0f5a1d77b890f83d61edf3b47bf8d5d7a420135e..94e663a8d323dd3fa6f85f75fbc5f7fe948425b6 100644
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -253,6 +253,9 @@ static struct rxrpc_call *rxrpc_alloc_incoming_call(struct rxrpc_sock *rx,
 	unsigned short call_tail, conn_tail, peer_tail;
 	unsigned short call_count, conn_count;
 
+	if (!b)
+		return NULL;
+
 	/* #calls >= #conns >= #peers must hold true. */
 	call_head = smp_load_acquire(&b->call_backlog_head);
 	call_tail = b->call_backlog_tail;