tracing: Fix memory leak in create_filter()

The create_filter() calls create_filter_start() which allocates a
"parse_error" descriptor, but fails to call create_filter_finish() that
frees it.

The op_stack and inverts in predicate_parse() were also not freed.

Found by kmemleak detector.

Cc: stable@vger.kernel.org
Fixes: 80765597bc587 ("tracing: Rewrite filter logic to be simpler and faster")
Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 84a65173b1e91dc347e5d98b1a831da42c1bd7bb..5574e862de8d52de579cdaac347891e82dd2548b 100644 (file)
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -570,11 +570,13 @@ predicate_parse(const char *str, int nr_parens, int nr_preds,
                }
        }
 
+       kfree(op_stack);
+       kfree(inverts);
        return prog;
 out_free:
        kfree(op_stack);
-       kfree(prog_stack);
        kfree(inverts);
+       kfree(prog_stack);
        return ERR_PTR(ret);
 }
 
@@ -1718,6 +1720,7 @@ static int create_filter(struct trace_event_call *call,
        err = process_preds(call, filter_string, *filterp, pe);
        if (err && set_str)
                append_filter_err(pe, *filterp);
+       create_filter_finish(pe);
 
        return err;
 }