From 54e80f9747d62efea50038655801ecb58d37b507 Mon Sep 17 00:00:00 2001
From: Alan Modra <amodra@gmail.com>
Date: Wed, 1 Jul 2026 10:57:51 +0930
Subject: [PATCH] libiberty d_compact_number signed integer overflow

https://lists.gnu.org/archive/html/bug-binutils/2026-06/msg00189.html
Fix this by doing the addition in unsigned arithmetic.
---
 libiberty/cp-demangle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libiberty/cp-demangle.c b/libiberty/cp-demangle.c
index 5f08ef8946a..ab122fc388d 100644
--- a/libiberty/cp-demangle.c
+++ b/libiberty/cp-demangle.c
@@ -3266,7 +3266,7 @@ d_compact_number (struct d_info *di)
   else if (d_peek_char (di) == 'n')
     return -1;
   else
-    num = d_number (di) + 1;
+    num = d_number (di) + 1u;
 
   if (num < 0 || ! d_check_char (di, '_'))
     return -1;