Sebastian Lackner : ntoskrnl.exe: Fix incorrect interpretation of SIB byte when parsing x86 opcode.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 927a44e676134506647b3ed50f75d32d56b610f5
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=927a44e676134506647b3ed50f...

Author: Sebastian Lackner 
Date:   Fri Nov  7 05:19:33 2014 +0100

ntoskrnl.exe: Fix incorrect interpretation of SIB byte when parsing x86 opcode.

---

dlls/ntoskrnl.exe/instr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/instr.c b/dlls/ntoskrnl.exe/instr.c
index 85ab9eb..fe35686 100644
--- a/dlls/ntoskrnl.exe/instr.c
+++ b/dlls/ntoskrnl.exe/instr.c
@@ -139,7 +139,7 @@ static BYTE *INSTR_GetOperandAddr( CONTEXT *context, BYTE *instr,
             GET_VAL( &sib, BYTE );
             rm = sib & 7;
             ss = sib >> 6;
-            switch(sib >> 3)
+            switch((sib >> 3) & 7)
             {
             case 0: index = context->Eax; break;
             case 1: index = context->Ecx; break;