[syslinux] [PATCH] core/diskboot.inc: fix handover info sanity checks

[Michal Soltys]

Signed-off-by: Michal Soltys <soltys at ziu.info>
---
 core/diskboot.inc |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/diskboot.inc b/core/diskboot.inc
index 7c02066..3d48dfd 100644
--- a/core/diskboot.inc
+++ b/core/diskboot.inc
@@ -182,12 +182,12 @@ floppy:
 harddisk:
 		mov dx,[di-76-10]	; Original DS
 		mov si,[di-76-12]	; Original SI
-		shr si,4
-		jz .no_partition	; SI == 0 -> assume no partition
+		shl dx,4
 		add dx,si
+		jz .no_partition	; DS:SI == 0 -> assume no partition
 		cmp dx,1024		; DS:SI < 1K (inside the IVT)?
 		jb .no_partition
-		cmp dx,PartInfo >> 4	; DS:SI in overwritten memory?
+		cmp dx,PartInfo		; DS:SI in overwritten memory?
 		jae .no_partition
 		test byte [di-76],7Fh	; Sanity check: "active flag" should
 		jnz .no_partition	; be 00 or 80
-- 
1.7.2.1