Patch "KVM: x86: zero base3 of unusable segments" 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: zero base3 of unusable segments

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-zero-base3-of-unusable-segments.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: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <[email protected]>
Date: Thu, 18 May 2017 19:37:30 +0200
Subject: KVM: x86: zero base3 of unusable segments
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Radim Krčmář <[email protected]>

commit f0367ee1d64d27fa08be2407df5c125442e885e3 upstream.

Static checker noticed that base3 could be used uninitialized if the segment was not present (useable). Random stack values probably would not pass VMCS entry checks.

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

@@ -4999,6 +4999,8 @@ static bool emulator_get_segment(struct
 
 	if (var.unusable) {
 		memset(desc, 0, sizeof(*desc));
+		if (base3)
+			*base3 = 0;
 		return false;
 	}
 

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

queue-4.9/kvm-nvmx-fix-exception-injection.patch queue-4.9/kvm-x86-vpmu-fix-undefined-shift-in-intel_pmu_refresh.patch queue-4.9/kvm-x86-zero-base3-of-unusable-segments.patch queue-4.9/kvm-x86-fix-fixing-of-hypercalls.patch