[Linux-stable-mirror] KVM: Fix stack-out-of-bounds read in write_mmio

Commit: e39d200fa5bf5b94a0948db0dae44c1b73b84a56 Target Stable Tree Branch: 4.9.y Why this patch is needed: Due to a request to handle CVE-2017-17741, we would need to backport this patch to our kernel. The patch is already in mainline:https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... Could you please include this patch in 4.9.y stable tree branch?

--AH