• Mike Christie's avatar
    configfs: fix registered group removal · cc57c073
    Mike Christie authored
    This patch fixes a bug where configfs_register_group had added
    a group in a tree, and userspace has done a rmdir on a dir somewhere
    above that group and we hit a kernel crash. The problem is configfs_rmdir
    will detach everything under it and unlink groups on the default_groups
    list. It will not unlink groups added with configfs_register_group so when
    configfs_unregister_group is called to drop its references to the group/items
    we crash when we try to access the freed dentrys.
    
    The patch just adds a check for if a rmdir has been done above
    us and if so just does the unlink part of unregistration.
    
    Sorry if you are getting this multiple times. I thouhgt I sent
    this to some of you and lkml, but I do not see it.
    Signed-off-by: 's avatarMike Christie <mchristi@redhat.com>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Joel Becker <jlbec@evilplan.org>
    Signed-off-by: 's avatarChristoph Hellwig <hch@lst.de>
    cc57c073
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