x86_emulate: Fix FNSTCW/FNSTSW modrm range check.

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>

diff --git a/xen/arch/x86/x86_emulate.c b/xen/arch/x86/x86_emulate.c
index fb9f16df1273bc95f27592e05fcdee2317ecba04..d75f49c50413f9fc09729d13a8b64b93aa54e2d0 100644 (file)
--- a/xen/arch/x86/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate.c
@@ -2671,7 +2671,7 @@ x86_emulate(
         fail_if(ops->load_fpu_ctxt == NULL);
         ops->load_fpu_ctxt(ctxt);
         fail_if((modrm_reg & 7) != 7);
-        fail_if(modrm_reg >= 0xc0);
+        fail_if(modrm >= 0xc0);
         /* fnstcw m2byte */
         ea.bytes = 2;
         dst = ea;
@@ -2690,7 +2690,7 @@ x86_emulate(
         fail_if(ops->load_fpu_ctxt == NULL);
         ops->load_fpu_ctxt(ctxt);
         fail_if((modrm_reg & 7) != 7);
-        fail_if(modrm_reg >= 0xc0);
+        fail_if(modrm >= 0xc0);
         /* fnstsw m2byte */
         ea.bytes = 2;
         dst = ea;