From 0951ccdfa2eee85e71ddcec6a45c87ce37772c69 Mon Sep 17 00:00:00 2001
From: yaoguangzhong <yaoguangzhong@xfusion.com>
Date: Sat, 7 Jan 2023 15:02:18 +0800
Subject: [PATCH] Fix memory leak that occurs on JSON parsing error

From Author: Martin Vierula <martin.vierula@trustwave.com>
commit c6582df2e5e3a92ba4b90e2a6cfaeb89f61bcadf
---
 apache2/msc_json.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/apache2/msc_json.c b/apache2/msc_json.c
index d69e9eb..cbaab0e 100644
--- a/apache2/msc_json.c
+++ b/apache2/msc_json.c
@@ -351,11 +351,12 @@ int json_process_chunk(modsec_rec *msr, const char *buf, unsigned int size, char
     /* Feed our parser and catch any errors */
     msr->json->status = yajl_parse(msr->json->handle, buf, size);
     if (msr->json->status != yajl_status_ok) {
-        /* We need to free the yajl error message later, how to do this? */
 	if (msr->json->depth_limit_exceeded) {
            *error_msg = "JSON depth limit exceeded";
 	} else {
-           *error_msg = yajl_get_error(msr->json->handle, 0, NULL, 0);
+           char *yajl_err = yajl_get_error(msr->json->handle, 0, buf, size);
+           *error_msg = apr_pstrdup(msr->mp, yajl_err);
+           yajl_free_error(msr->json->handle, yajl_err);
 	}
         return -1;
     }
@@ -375,11 +376,12 @@ int json_complete(modsec_rec *msr, char **error_msg) {
     /* Wrap up the parsing process */
     msr->json->status = yajl_complete_parse(msr->json->handle);
     if (msr->json->status != yajl_status_ok) {
-        /* We need to free the yajl error message later, how to do this? */
 	if (msr->json->depth_limit_exceeded) {
            *error_msg = "JSON depth limit exceeded";
 	} else {
-           *error_msg = yajl_get_error(msr->json->handle, 0, NULL, 0);
+           char *yajl_err = yajl_get_error(msr->json->handle, 0, NULL, 0);
+            *error_msg = apr_pstrdup(msr->mp, yajl_err);
+            yajl_free_error(msr->json->handle, yajl_err);
 	}
 
         return -1;
-- 
2.27.0