From 171f2e787d4bc1d644acbede5eaf7641ff6a18d6 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Wed, 30 Apr 2014 02:38:30 +0000
Subject: [PATCH] compiler: Don't overwrite memory if an archive has a bad file
 name.

From-SVN: r209924
---
 gcc/go/gofrontend/import-archive.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/go/gofrontend/import-archive.cc b/gcc/go/gofrontend/import-archive.cc
index 9a1d5b3d7ef..34fb528ab5c 100644
--- a/gcc/go/gofrontend/import-archive.cc
+++ b/gcc/go/gofrontend/import-archive.cc
@@ -261,7 +261,7 @@ Archive_file::interpret_header(const Archive_header* hdr, off_t off,
   char size_string[size_string_size + 1];
   memcpy(size_string, hdr->ar_size, size_string_size);
   char* ps = size_string + size_string_size;
-  while (ps[-1] == ' ')
+  while (ps > size_string && ps[-1] == ' ')
     --ps;
   *ps = '\0';
 
-- 
2.30.2