From: Ido Yariv Date: Fri, 21 Oct 2016 16:39:57 +0000 (-0400) Subject: KVM: x86: fix wbinvd_dirty_mask use-after-free X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=bd768e146624cbec7122ed15dead8daa137d909d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git KVM: x86: fix wbinvd_dirty_mask use-after-free vcpu->arch.wbinvd_dirty_mask may still be used after freeing it, corrupting memory. For example, the following call trace may set a bit in an already freed cpu mask: kvm_arch_vcpu_load vcpu_load vmx_free_vcpu_nested vmx_free_vcpu kvm_arch_vcpu_free Fix this by deferring freeing of wbinvd_dirty_mask. Cc: stable@vger.kernel.org Signed-off-by: Ido Yariv Reviewed-by: Paolo Bonzini Signed-off-by: Radim Krčmář --- diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 0b2087981c06..e954be8a3185 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7410,10 +7410,12 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) { + void *wbinvd_dirty_mask = vcpu->arch.wbinvd_dirty_mask; + kvmclock_reset(vcpu); - free_cpumask_var(vcpu->arch.wbinvd_dirty_mask); kvm_x86_ops->vcpu_free(vcpu); + free_cpumask_var(wbinvd_dirty_mask); } struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,