KVM: emulate: avoid accessing NULL ctxt->memopp

commit a430c9166312e1aa3d80bce32374233bdbfeba32 upstream.

A failure to decode the instruction can cause a NULL pointer access.
This is fixed simply by moving the "done" label as close as possible
to the return.

This fixes CVE-2014-8481.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Fixes: 41061cdb98a0bec464278b4db8e894a3121671f5
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 41157106f548e7875fa095e50dd38ce7e5e6282c..258b0d9349941f5028165cead5a7e29ee171b90d 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4481,10 +4481,10 @@ done_prefixes:
        /* Decode and fetch the destination operand: register or memory. */
        rc = decode_operand(ctxt, &ctxt->dst, (ctxt->d >> DstShift) & OpMask);
 
-done:
        if (ctxt->rip_relative)
                ctxt->memopp->addr.mem.ea += ctxt->_eip;
 
+done:
        return (rc != X86EMUL_CONTINUE) ? EMULATION_FAILED : EMULATION_OK;
 }