From: Nicholas Krause <xerofoify@gmail.com>
Date: Wed, 30 Dec 2015 18:08:46 +0000 (-0500)
Subject: kvm: x86: Check kvm_write_guest return value in kvm_write_wall_clock
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1dab1345d885819a3a0d5d08ce0b5c2e12c65343;p=openwrt%2Fstaging%2Fblogic.git

kvm: x86: Check kvm_write_guest return value in kvm_write_wall_clock

This makes sure the wall clock is updated only after an odd version value
is successfully written to guest memory.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b6102c1eb3b1..102c3028513f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1169,7 +1169,8 @@ static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 
 	++version;
 
-	kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
+	if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version)))
+		return;
 
 	/*
 	 * The guest calculates current wall clock time by adding