[PATCH] Fix duplicate free for GATT service includes

* [PATCH] Fix duplicate free for GATT service includes
@ 2020-11-20  0:22 Pavel Maltsev
  2020-11-20  1:00 ` bluez.test.bot
  0 siblings, 1 reply; 5+ messages in thread
From: Pavel Maltsev @ 2020-11-20  0:22 UTC (permalink / raw)
  To: linux-bluetooth; +Cc: Pavel Maltsev

Objects in the service->includes queue are obtained via
dbus_message_iter_get_basic call and according to the
contract for the value is that it is returned by the reference
and should not be freed thus we should make a copy.

This will fix the issue when the GATT service app is disconnected
(reproduced with gatt-service included in bluez), bluetoothd is crashing:

src/gatt-database.c:gatt_db_service_removed() Local GATT service removed
src/adapter.c:adapter_service_remove() /org/bluez/hci0
src/adapter.c:remove_uuid() sending remove uuid command for index 0
src/gatt-database.c:proxy_removed_cb() Proxy removed - removing service: /serv1
munmap_chunk(): invalid pointer
---
 src/gatt-database.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/gatt-database.c b/src/gatt-database.c
index 6694a0174..90cc4bade 100644
--- a/src/gatt-database.c
+++ b/src/gatt-database.c
@@ -1999,6 +1999,7 @@ static bool parse_includes(GDBusProxy *proxy, struct external_service *service)
 	DBusMessageIter iter;
 	DBusMessageIter array;
 	char *obj;
+	char *includes;
 	int type;
 
 	/* Includes property is optional */
@@ -2017,7 +2018,11 @@ static bool parse_includes(GDBusProxy *proxy, struct external_service *service)
 
 		dbus_message_iter_get_basic(&array, &obj);
 
-		if (!queue_push_tail(service->includes, obj)) {
+		includes = g_strdup(obj);
+		if (!includes)
+			return false;
+
+		if (!queue_push_tail(service->includes, includes)) {
 			error("Failed to add Includes path in queue\n");
 			return false;
 		}
-- 
2.29.2.454.gaff20da3a2-goog


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