Gio: prevent a freeze when mounting a LVM volume (bgo#699735)

For some reason the HardwareManager could not get a GudevDevice
from the Volume.Drive in this case, which resulted in passing
null to UdevMetadataSource and causing a NullReferenceException,
which would make Banshee freeze.

Fix this by checking for null after calling GudevDeviceFromGioDrive.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawVolume.cs b/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawVolume.cs
index 0ac09f98a..5e8dc801b 100644
--- a/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawVolume.cs
+++ b/src/Backends/Banshee.Gio/Banshee.Hardware.Gio/LowLevel/RawVolume.cs
@@ -239,10 +239,15 @@ namespace Banshee.Hardware.Gio
                 if (Volume.Drive == null) {
                     return null;
                 }
+
+                var device = Manager.GudevDeviceFromGioDrive (Volume.Drive);
+                if (device == null) {
+                    return null;
+                }
                 return new RawBlockDevice (Volume.Drive,
                                            Manager,
                                            new GioDriveMetadetaSource (Volume.Drive),
-                                           new UdevMetadataSource (Manager.GudevDeviceFromGioDrive (Volume.Drive)));
+                                           new UdevMetadataSource (device));
             }
         }