Obtain ref on root dentry in mqfs.GetFilesystem. #6778
Merged
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Obtain ref on root dentry in mqfs.GetFilesystem.
As documented in FilesystemType.GetFilesystem, a reference should be taken on
the returned dentry and filesystem by GetFilesystem implementation. mqfs did
not do that.
Additionally cleanup and clarify ref counting of dentry, filesystem and mount
in mqfs.
Reported-by: syzbot+a2c54bfb6e1525228e5f@syzkaller.appspotmail.com
Reported-by: syzbot+ccd305cdab11cfebbfff@syzkaller.appspotmail.com