Bluetooth device discovery agent (bluez): Prevent null pointer access.

We would potentially access a null adapter if stop() was called from a
user slot connected to the deviceDiscovered() signal.

Task-number: QTBUG-48481
Change-Id: I784120dcd7a9f71d9532fac9538ae98e1a329db2
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/bluetooth/qbluetoothdevicediscoveryagent_bluez.cpp b/src/bluetooth/qbluetoothdevicediscoveryagent_bluez.cpp
index 4d296d20..dd81ae1f 100644
--- a/src/bluetooth/qbluetoothdevicediscoveryagent_bluez.cpp
+++ b/src/bluetooth/qbluetoothdevicediscoveryagent_bluez.cpp
@@ -247,6 +247,8 @@ void QBluetoothDeviceDiscoveryAgentPrivate::startBluez5()
                         continue; //devices whose path doesn't start with same path we skip
 
                     deviceFoundBluez5(path.path());
+                    if (!isActive()) // Can happen if stop() was called from a slot in user code.
+                      return;
                 }
             }
         }