Patch "kvm: fix page struct leak in handle_vmon" has been added to the 4.10-stable tree

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

kvm: fix page struct leak in handle_vmon

to the 4.10-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-fix-page-struct-leak-in-handle_vmon.patch
and it can be found in the queue-4.10 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: Tue, 24 Jan 2017 11:56:21 +0100
Subject: kvm: fix page struct leak in handle_vmon

From: Paolo Bonzini <[email protected]>

commit 06ce521af9558814b8606c0476c54497cf83a653 upstream.

handle_vmon gets a reference on VMXON region page, but does not release it. Release the reference.

Found by syzkaller; based on a patch by Dmitry.

---
 arch/x86/kvm/vmx.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

@@ -7086,13 +7086,18 @@ static int nested_vmx_check_vmptr(struct
 		}
 
 		page = nested_get_page(vcpu, vmptr);
-		if (page == NULL ||
-		    *(u32 *)kmap(page) != VMCS12_REVISION) {
+		if (page == NULL) {
 			nested_vmx_failInvalid(vcpu);
+			return kvm_skip_emulated_instruction(vcpu);
+		}
+		if (*(u32 *)kmap(page) != VMCS12_REVISION) {
 			kunmap(page);
+			nested_release_page_clean(page);
+			nested_vmx_failInvalid(vcpu);
 			return kvm_skip_emulated_instruction(vcpu);
 		}
 		kunmap(page);
+		nested_release_page_clean(page);
 		vmx->nested.vmxon_ptr = vmptr;
 		break;
 	case EXIT_REASON_VMCLEAR:

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

queue-4.10/kvm-fix-page-struct-leak-in-handle_vmon.patch