From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Tue, 9 Jan 2024 00:40:42 +0000 (-0800)
Subject: Improved array enumeration with length 0.
X-Git-Url: http://www.kaiwu.me/postgresql/commit/?a=commitdiff_plain;h=b668b27356f8c6b14cc93f186bd1fbb69af3b072;p=njs.git

Improved array enumeration with length 0.

The fix eliminates an arithmetic operation with NULL pointer.

Found by UndefinedBehaviorSanitizer.
---

diff --git a/src/njs_object.c b/src/njs_object.c
index 4fab06e7..e8901958 100644
--- a/src/njs_object.c
+++ b/src/njs_object.c
@@ -591,7 +591,7 @@ njs_object_enumerate_array(njs_vm_t *vm, const njs_array_t *array,
     njs_value_t  *p, *start, *end;
     njs_array_t  *entry;
 
-    if (!array->object.fast_array) {
+    if (!array->object.fast_array || array->length == 0) {
         return NJS_OK;
     }