linux-kernel - [PATCH] tracing: prevent memory leak

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Date:   Fri, 20 Sep 2019 17:57:59 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] tracing: prevent memory leak

In predicate_parse, there is an error path that is not going to
out_free instead it returns directly which leads to memory leak.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 kernel/trace/trace_events_filter.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index c773b8fb270c..c9a74f82b14a 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -452,8 +452,10 @@ predicate_parse(const char *str, int nr_parens, int nr_preds,
 
 		switch (*next) {
 		case '(':					/* #2 */
-			if (top - op_stack > nr_parens)
-				return ERR_PTR(-EINVAL);
+			if (top - op_stack > nr_parens) {
+				ret = -EINVAL;
+				goto out_free;
+			}
 			*(++top) = invert;
 			continue;
 		case '!':					/* #3 */
-- 
2.17.1