in_elasticsearch: improved buffer size check

Signed-off-by: Leonardo Alminana <leonardo.alminana@chronosphere.io>
fluent · Sep 5, 2024 · bf83631 · bf83631
1 parent 2ff5372
commit bf83631
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/plugins/in_elasticsearch/in_elasticsearch_bulk_conn.c b/plugins/in_elasticsearch/in_elasticsearch_bulk_conn.c
@@ -116,9 +116,10 @@ static int in_elasticsearch_bulk_conn_event(void *data)
             }
 
             if (NULL != request_end) {
-                request_len = (size_t)(request_end - conn->buf_data);
+                request_len = (size_t) ((uintptr_t) request_end -
+                                        (uintptr_t) conn->buf_data);
 
-                if (0 < (conn->buf_len - request_len)) {
+                if (request_len < conn->buf_len) {
                     memmove(conn->buf_data, &conn->buf_data[request_len],
                             conn->buf_len - request_len);