linux-kernel - [PATCH v2] tracing: Fix possible memory leak in __create_synth

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Date:   Thu,  9 Dec 2021 02:43:17 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     rostedt@...dmis.org
Cc:     linmq006@...il.com, linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: [PATCH v2] tracing: Fix possible memory leak in __create_synth_event

Before goto err, call argv_free to handle argv in order to prevent
memory leak.

Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Suggested-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
Changes in v2:
use a cleaner way to handle cleanup operations
---
---
 kernel/trace/trace_events_synth.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c
index 22db3ce95e74..c4a490ec7a38 100644
--- a/kernel/trace/trace_events_synth.c
+++ b/kernel/trace/trace_events_synth.c
@@ -1262,26 +1262,26 @@ static int __create_synth_event(const char *name, const char *raw_fields)
 			if (cmd_version > 1 && n_fields_this_loop >= 1) {
 				synth_err(SYNTH_ERR_INVALID_CMD, errpos(field_str));
 				ret = -EINVAL;
-				goto err;
+				goto err_free_arg;
 			}
 
 			fields[n_fields++] = field;
 			if (n_fields == SYNTH_FIELDS_MAX) {
 				synth_err(SYNTH_ERR_TOO_MANY_FIELDS, 0);
 				ret = -EINVAL;
-				goto err;
+				goto err_free_arg;
 			}
 
 			n_fields_this_loop++;
 		}
 
+		argv_free(argv);
 		if (consumed < argc) {
 			synth_err(SYNTH_ERR_INVALID_CMD, 0);
 			ret = -EINVAL;
 			goto err;
 		}
 
-		argv_free(argv);
 	}
 
 	if (n_fields == 0) {
@@ -1307,6 +1307,8 @@ static int __create_synth_event(const char *name, const char *raw_fields)
 	kfree(saved_fields);
 
 	return ret;
+ err_free_arg:
+	argv_free(argv);
  err:
 	for (i = 0; i < n_fields; i++)
 		free_synth_field(fields[i]);
-- 
2.17.1