PMOUNT_ENTRY should have a lock that is acquired while holding the dokanGlobal->Resource lock (already used by FindMountEntry ) and that new lock should be released when PMOUNT_ENTRY is not longer required. dokanGlobal->Resource lock can be released after locking PMOUNT_ENTRY.
RemoveMountEntry will also need to hold this lock with dokanGlobal->Resource and the new lock acquired.
As discovered by https://ci.appveyor.com/project/Maxhy/dokany/builds/48885006/job/9yspbde528vgbq3m , nothing prevents a
PMOUNT_ENTRYretrieved fromFindMountEntryorFindMountEntryByNameto become unsafe due to a removal during a concurrent parallel unmountDokanDeleteDeviceObject.PMOUNT_ENTRYshould have a lock that is acquired while holding thedokanGlobal->Resourcelock (already used byFindMountEntry) and that new lock should be released whenPMOUNT_ENTRYis not longer required.dokanGlobal->Resourcelock can be released after lockingPMOUNT_ENTRY.RemoveMountEntrywill also need to hold this lock withdokanGlobal->Resourceand the new lock acquired.