• David Vrabel's avatar
    xen/gntalloc: safely delete grefs in add_grefs() undo path · 5903c6bd
    David Vrabel authored
    If a gref could not be added (perhaps because the limit has been
    reached or there are no more grant references available), the undo
    path may crash because __del_gref() frees the gref while it is being
    used for a list iteration.
    
    A comment suggests that using list_for_each_entry() is safe since the
    gref isn't removed from the list being iterated over, but it is freed
    and thus list_for_each_entry_safe() must be used.
    
    Also, explicitly delete the gref from the local per-file list, even
    though this is not strictly necessary.
    Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
    Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
    5903c6bd
gntalloc.c 15.3 KB