From 0f02fbd9ffc0c26fa160505872a6c0d0b0493028 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 9 Nov 2023 16:39:49 +0900
Subject: Range check in pm_constant_id_lookup

---
 prism_compile.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/prism_compile.c b/prism_compile.c
index dd8cdd9222..b5dc08f074 100644
--- a/prism_compile.c
+++ b/prism_compile.c
@@ -719,6 +719,9 @@ pm_lookup_local_index_with_depth(rb_iseq_t *iseq, pm_scope_node_t *scope_node, p
 static ID
 pm_constant_id_lookup(pm_scope_node_t *scope_node, pm_constant_id_t constant_id)
 {
+    if (constant_id < 1 || constant_id > scope_node->parser->constant_pool.size) {
+        rb_raise(rb_eArgError, "[PRISM] constant_id out of range: %u", (unsigned int)constant_id);
+    }
     return scope_node->constants[constant_id - 1];
 }
 
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