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69d71879d2
As writing into stack_trace_filter, the iter-tr is not set and is NULL. Check if it is NULL before dereferencing it in ftrace_regex_release(). Fixes: 8c08f0d5c6fb ("ftrace: Have cached module filters be an active filter") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>