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From: Anthony Liguori <anthony@codemonkey.ws>
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Date: Fri, 20 Mar 2009 16:13:42 +0000
Subject: [Qemu-devel] [6863] x86: Add NULL check to lsl (Jan Kiszka)
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Revision: 6863
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6863
Author:   aliguori
Date:     2009-03-20 16:13:41 +0000 (Fri, 20 Mar 2009)
Log Message:
-----------
x86: Add NULL check to lsl (Jan Kiszka)

According to the Intel specs, lsl performs a check against NULL for the
provided selector, just like lar does. helper_lar() includes the
corresponding code, helper_lsl() was lacking it so far.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

Modified Paths:
--------------
    trunk/target-i386/op_helper.c

Modified: trunk/target-i386/op_helper.c
===================================================================
--- trunk/target-i386/op_helper.c	2009-03-20 15:59:24 UTC (rev 6862)
+++ trunk/target-i386/op_helper.c	2009-03-20 16:13:41 UTC (rev 6863)
@@ -3241,6 +3241,8 @@
 
     selector = selector1 & 0xffff;
     eflags = helper_cc_compute_all(CC_OP);
+    if ((selector & 0xfffc) == 0)
+        goto fail;
     if (load_segment(&e1, &e2, selector) != 0)
         goto fail;
     rpl = selector & 3;