From 5481040197402be6dfee265bd2ff5a4c88e30505 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lu=C3=ADs=20Ferreira?= <contact@lsferreira.net>
Date: Thu, 23 Sep 2021 11:33:47 -0400
Subject: [PATCH] libiberty: prevent buffer overflow when decoding user input

libiberty/
	* d-demangle.c (dlang_symbol_backref): Ensure strlen of
	string is less than length computed by dlang_number.
---
 libiberty/d-demangle.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libiberty/d-demangle.c b/libiberty/d-demangle.c
index a2152cc6551..7ded3e2a256 100644
--- a/libiberty/d-demangle.c
+++ b/libiberty/d-demangle.c
@@ -381,7 +381,7 @@ dlang_symbol_backref (string *decl, const char *mangled,
 
   /* Must point to a simple identifier.  */
   backref = dlang_number (backref, &len);
-  if (backref == NULL)
+  if (backref == NULL || strlen(backref) < len)
     return NULL;
 
   backref = dlang_lname (decl, backref, len);