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

927a44e6 · Sebastian Lackner · Alexandre Julliard · bd6a5de2 · 927a44e6
Commit 927a44e6 authored Nov 07, 2014 by Sebastian Lackner Committed by Alexandre Julliard Nov 07, 2014
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instr.c dlls/ntoskrnl.exe/instr.c +1 -1

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--- 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;