[PATCH BlueZ 3/3] bass: Add checks for bap user data

[Iulia Tanasescu <iulia.tanasescu@nxp.com>]

This adds checks before parsing bt_bap user data in bap attached/detached,
to avoid accessing NULL pointers in case the user data has been cleared
or has not been set before attaching a BAP session.
---
 profiles/audio/bass.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/profiles/audio/bass.c b/profiles/audio/bass.c
index 6c84fa1c3..67ee847b8 100644
--- a/profiles/audio/bass.c
+++ b/profiles/audio/bass.c
@@ -559,14 +559,21 @@ static void confirm_cb(GIOChannel *io, void *user_data)
 
 static void bap_attached(struct bt_bap *bap, void *user_data)
 {
-	struct btd_service *service = bt_bap_get_user_data(bap);
-	struct btd_device *device = btd_service_get_device(service);
-	struct btd_adapter *adapter = device_get_adapter(device);
+	struct btd_service *service;
+	struct btd_device *device;
+	struct btd_adapter *adapter;
 	struct bass_delegator *dg;
 	GError *err = NULL;
 
 	DBG("%p", bap);
 
+	service = bt_bap_get_user_data(bap);
+	if (!service)
+		return;
+
+	device = btd_service_get_device(service);
+	adapter = device_get_adapter(device);
+
 	dg = queue_find(delegators, delegator_match_device, device);
 	if (!dg)
 		/* Only probe devices added via Broadcast Assistants */
@@ -620,12 +627,18 @@ static void setup_free(void *data)
 
 static void bap_detached(struct bt_bap *bap, void *user_data)
 {
-	struct btd_service *service = bt_bap_get_user_data(bap);
-	struct btd_device *device = btd_service_get_device(service);
+	struct btd_service *service;
+	struct btd_device *device;
 	struct bass_delegator *dg;
 
 	DBG("%p", bap);
 
+	service = bt_bap_get_user_data(bap);
+	if (!service)
+		return;
+
+	device = btd_service_get_device(service);
+
 	dg = queue_remove_if(delegators, delegator_match_device, device);
 	if (!dg)
 		return;
-- 
2.43.0