fix use after free

libtel.c

@@ -1,4 +1,5 @@
 #include <arpa/inet.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
 #include <stdint.h>
@@ -54,8 +55,9 @@ int tel_get_addr(char *ip, char *port, struct sockaddr **addr, socklen_t *addr_l
 	int res = getaddrinfo(ip, port, &hints, &info);
 	if(res != 0) return res;
 
-	*addr = info->ai_addr;
+	*addr = malloc(info->ai_addrlen);
 	*addr_len = info->ai_addrlen;
+	memcpy(*addr, info->ai_addr, info->ai_addrlen);
 
 	freeaddrinfo(info);
 	return 0;

teld.c

@@ -157,6 +157,7 @@ void client_pickup(struct call_buf *call_buf, int stream) {
 	union tel_sa_any remote_addr;
 	socklen_t remote_addr_len = sizeof(union tel_sa_any);
 	res = tel_read_sockaddr(stream, &remote_addr, &remote_addr_len);
+	if(res < 0) goto err;
 
 	int idx = call_buf_search(call_buf, &remote_addr);
 	if(idx < 0) {
@@ -175,6 +176,10 @@ void client_pickup(struct call_buf *call_buf, int stream) {
 	};
 	close(fd);
 	return;
+
+err:
+	printf("error picking up call: %s\n", strerror(errno));
+	tel_write_err(stream, strerror(errno));
 }
 
 void client_call(int stream, struct config cfg) {