grub2/0251-efi-chainloader-fix-wrong-sanity-check-in-relocate_c.patch

From c43a523e3b257fbba68d7b67397c7ab64e89dd26 Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Mon, 21 Nov 2016 15:34:00 +0100
Subject: [PATCH] efi/chainloader: fix wrong sanity check in relocate_coff()

In relocate_coff(), the relocation entries are parsed from the original
image (not the section-wise copied image). The original image is
pointed-to by the "orig" pointer. The current check

  (void *)reloc_end < data

compares the addresses of independent memory allocations. "data" is a typo
here, it should be "orig".

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1347291
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Bogdan Costescu <bcostescu@gmail.com>
Tested-by: Juan Orti <j.orti.alcaine@gmail.com>
---
 grub-core/loader/efi/chainloader.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index b977c7b5573..d5ab21d09c3 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -401,7 +401,7 @@ relocate_coff (pe_coff_loader_image_context_t *context,
       reloc_end = (struct grub_pe32_fixup_block *)
 	((char *)reloc_base + reloc_base->size);
 
-      if ((void *)reloc_end < data || (void *)reloc_end > image_end)
+      if ((void *)reloc_end < orig || (void *)reloc_end > image_end)
         {
           grub_error (GRUB_ERR_BAD_ARGUMENT, "Reloc entry %d overflows binary",
 		      n);