[PATCH BlueZ] client: Fix uninitialized read in attribute handle

[Alicia Boya Garcia <ntrrgc@gmail.com>]

When services, characteristics and descriptors were parsed from DBus
proxies the client code was calling the print code without initializing
the `handle` field, which the print functions use.

This resulted in semi-random or zero handles in all attributes when
using gatt.list-attributes in bluetoothctl, depending on compilation
flags.

This patch fixes the problem by parsing the handle from the DBus proxy
path.
---
 client/gatt.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/client/gatt.c b/client/gatt.c
index 21fd38ecf..4c074706c 100644
--- a/client/gatt.c
+++ b/client/gatt.c
@@ -158,6 +158,15 @@ static void print_inc_service(struct service *service, const char *description)
 					service->uuid, text);
 }
 
+static uint16_t handle_from_path(const char *path)
+{
+	const char *number = path + strlen(path) - 4;
+	if (number < path)
+		return 0;
+
+	return (uint16_t) strtol(number, NULL, 16);
+}
+
 static void print_service_proxy(GDBusProxy *proxy, const char *description)
 {
 	struct service service;
@@ -178,6 +187,7 @@ static void print_service_proxy(GDBusProxy *proxy, const char *description)
 	service.path = (char *) g_dbus_proxy_get_path(proxy);
 	service.uuid = (char *) uuid;
 	service.primary = primary;
+	service.handle = handle_from_path(service.path);
 
 	print_service(&service, description);
 }
@@ -259,6 +269,7 @@ static void print_characteristic(GDBusProxy *proxy, const char *description)
 
 	chrc.path = (char *) g_dbus_proxy_get_path(proxy);
 	chrc.uuid = (char *) uuid;
+	chrc.handle = handle_from_path(chrc.path);
 
 	print_chrc(&chrc, description);
 }
@@ -352,6 +363,7 @@ static void print_descriptor(GDBusProxy *proxy, const char *description)
 
 	desc.path = (char *) g_dbus_proxy_get_path(proxy);
 	desc.uuid = (char *) uuid;
+	desc.handle = handle_from_path(desc.path);
 
 	print_desc(&desc, description);
 }
-- 
2.37.1