KVM: emulate: avoid accessing NULL ctxt->memopp

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>
Cc: stable@vger.kernel.org
Fixes: 4f5ee7780a8e229349a8b9366434959f76cbf56c
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 02c8ea804aaf5e13d0e5fceb284d6b0a0b906157..eb3b1c46f995d17b242ff5d80d2cdc6d87336d0d 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4580,10 +4580,10 @@ 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;
 }