[Xen-changelog] [xen-unstable] x86/32on64: zero-extend hypercall index before use in memory access (debug mode only)

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1292415031 0
# Node ID d8279118b4bbb3bb3689b9c20abb25d0c09e2b69
# Parent  20c65aa19075b1a696adb56325827412596ac0d4
x86/32on64: zero-extend hypercall index before use in memory access (debug mode 
only)

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/arch/x86/x86_64/compat/entry.S |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r 20c65aa19075 -r d8279118b4bb xen/arch/x86/x86_64/compat/entry.S
--- a/xen/arch/x86/x86_64/compat/entry.S        Wed Dec 15 12:09:41 2010 +0000
+++ b/xen/arch/x86/x86_64/compat/entry.S        Wed Dec 15 12:10:31 2010 +0000
@@ -25,7 +25,8 @@ ENTRY(compat_hypercall)
         pushq UREGS_rbx(%rsp); pushq %rcx; pushq %rdx; pushq %rsi; pushq %rdi
         pushq UREGS_rbp+5*8(%rsp)
         leaq  compat_hypercall_args_table(%rip),%r10
-        movq  $6,%rcx
+        movl  %eax,%eax
+        movl  $6,%ecx
         subb  (%r10,%rax,1),%cl
         movq  %rsp,%rdi
         movl  $0xDEADBEEF,%eax

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