linux-kernel - [PATCH 1/3] tracing: Fix memory leak in create

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Date:   Tue, 11 Dec 2018 13:54:57 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org, Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH 1/3] tracing: Fix memory leak in create_filter()

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

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@...r.kernel.org
Fixes: 80765597bc587 ("tracing: Rewrite filter logic to be simpler and faster")
Reviewed-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
 kernel/trace/trace_events_filter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 84a65173b1e9..5574e862de8d 100644
--- 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;
 }
-- 
2.19.1