diff -up texinfo-7.1/info/makedoc.c.orig texinfo-7.1/info/makedoc.c
--- texinfo-7.1/info/makedoc.c.orig	2023-08-14 20:53:20.000000000 +0200
+++ texinfo-7.1/info/makedoc.c	2024-10-09 10:13:13.476369921 +0200
@@ -296,7 +296,7 @@ process_one_file (char *filename, FILE *
       char *func, *doc;
       char *func_name;
 
-      for (; offset < (file_size - decl_len); offset++)
+      for (; offset < (file_size - decl_len) && offset < (LONG_MAX - decl_len); offset++)
         {
           if (buffer[offset] == '\n')
             {