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It is necessary to call free_arg(arg) when add_filter_type() returns NULL in filter_event(). Signed-off-by: Hewenliang <[email protected]> Reviewed-by: Steven Rostedt (VMware) <[email protected]> Cc: Feilong Lin <[email protected]> Cc: Tzvetomir Stoyanov <[email protected]> Link: http://lore.kernel.org/lkml/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>