Patch "KVM: x86: cleanup the page tracking SRCU instance" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

KVM: x86: cleanup the page tracking SRCU instance

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
kvm-x86-cleanup-the-page-tracking-srcu-instance.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Paolo Bonzini <[email protected]>
Date: Mon, 27 Mar 2017 17:53:50 +0200
Subject: KVM: x86: cleanup the page tracking SRCU instance

From: Paolo Bonzini <[email protected]>

commit 2beb6dad2e8f95d710159d5befb390e4f62ab5cf upstream.

SRCU uses a delayed work item. Skip cleaning it up, and the result is use-after-free in the work item callbacks.

---
 arch/x86/include/asm/kvm_page_track.h |    1 +
 arch/x86/kvm/page_track.c             |    8 ++++++++
 arch/x86/kvm/x86.c                    |    1 +
 3 files changed, 10 insertions(+)

@@ -35,6 +35,7 @@ struct kvm_page_track_notifier_node {
 };
 
 void kvm_page_track_init(struct kvm *kvm);
+void kvm_page_track_cleanup(struct kvm *kvm);
 
 void kvm_page_track_free_memslot(struct kvm_memory_slot *free,
 				 struct kvm_memory_slot *dont);

@@ -156,6 +156,14 @@ bool kvm_page_track_is_active(struct kvm
 	return !!ACCESS_ONCE(slot->arch.gfn_track[mode][index]);
 }
 
+void kvm_page_track_cleanup(struct kvm *kvm)
+{
+	struct kvm_page_track_notifier_head *head;
+
+	head = &kvm->arch.track_notifier_head;
+	cleanup_srcu_struct(&head->track_srcu);
+}
+
 void kvm_page_track_init(struct kvm *kvm)
 {
 	struct kvm_page_track_notifier_head *head;

@@ -7976,6 +7976,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm
 	kvm_free_vcpus(kvm);
 	kvfree(rcu_dereference_check(kvm->arch.apic_map, 1));
 	kvm_mmu_uninit_vm(kvm);
+	kvm_page_track_cleanup(kvm);
 }
 
 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/kvm-x86-cleanup-the-page-tracking-srcu-instance.patch queue-4.9/kvm-nvmx-fix-nested-vpid-vmx-exec-control.patch