From 213dbedac2cd6e488dfd494573d0394cf7e76874 Mon Sep 17 00:00:00 2001
From: Martin Bickel <martin.bickel@continental-corporation.com>
Date: Wed, 28 Dec 2016 19:20:37 +0100
Subject: [PATCH] Add sanity check when calculating alignment

---
 elfio/elfio.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/elfio/elfio.hpp b/elfio/elfio.hpp
index 468140f..c983a9e 100644
--- a/elfio/elfio.hpp
+++ b/elfio/elfio.hpp
@@ -676,6 +676,11 @@ class elfio
                     // when possible (this is what matters for execution)
                     Elf64_Off req_offset = sec->get_address() - seg->get_virtual_address();
                     Elf64_Off cur_offset = current_file_pos - seg_start_pos;
+                    if ( req_offset < cur_offset) {
+                         // something has gone awfully wrong, abort!
+                         // secAlign would turn out negative, seeking backwards and overwriting previous data
+                         return false;
+                    }
                     secAlign             = req_offset - cur_offset;
                 }
                 else if (!section_generated[index]) {