Compatibility with libyajl decoding the buffer inline

Author: Marc Stern

apache2/msc_json.c

@@ -354,7 +354,9 @@ int json_init(modsec_rec *msr, char **error_msg) {
 int json_process_chunk(modsec_rec *msr, const char *buf, unsigned int size, char **error_msg) {
     if (error_msg == NULL) return -1;
     *error_msg = NULL;
-    base_offset=buf;
+    // Take a copy in case libyajl decodes the buffer inline
+    base_offset = apr_pstrmemdup(msr->mp, buf, size);
+    if (!base_offset) return -1;
 
     /* Feed our parser and catch any errors */
     msr->json->status = yajl_parse(msr->json->handle, buf, size);