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4aeb69672d
The set_ftrace_filter uses seq_file and reads from two lists. The pointer returned by t_next() can either be of type struct dyn_ftrace or struct ftrace_func_probe. If there is a bug (there was one) the wrong pointer may be used and the reference can cause an oops. This patch makes t_next() and friends only return the iterator structure which now has a pointer of type struct dyn_ftrace and struct ftrace_func_probe. The t_show() can now test if the pointer is NULL or not and if the pointer exists, it is guaranteed to be of the correct type. Now if there's a bug, only wrong data will be shown but not an oops. Cc: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>