From bf8c3b4a239af35b0d09320fe8a9039d8b7f079a Mon Sep 17 00:00:00 2001
From: Inuyasha-fan <927463646@qq.com>
Date: Thu, 13 Nov 2025 08:54:12 +0000
Subject: [PATCH] fix: prevent array out-of-bounds write in segv function.Add
 boundary checks to ensure array indices do not exceed the allocated size.

---
 include/xsf/specfun/specfun.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/include/xsf/specfun/specfun.h b/include/xsf/specfun/specfun.h
index 62476018f7..e550a3a1f7 100644
--- a/include/xsf/specfun/specfun.h
+++ b/include/xsf/specfun/specfun.h
@@ -6055,10 +6055,14 @@ namespace specfun {
                     }
                 }
                 cv0[k - 1] = x1;
+                int index = 0;
                 if (l == 0)
-                    eg[2 * k - 2] = cv0[k - 1];
+                    index = 2 * k - 2;
                 if (l == 1)
-                    eg[2 * k - 1] = cv0[k - 1];
+                    index = 2 * k - 1;
+                // boundary check
+                if (index >= n - m + 1) break;
+                eg[index] = cv0[k - 1];
             }
         }
         *cv = eg[n - m];