linux-kernel - [PATCH] kvm: svm: fix unsigned compare less than zero comparison

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Message-Id: <20160919061159.6341-1-colin.king@canonical.com>
Date:   Mon, 19 Sep 2016 07:11:59 +0100
From:   Colin King <colin.king@...onical.com>
To:     Joerg Roedel <joro@...tes.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] kvm: svm: fix unsigned compare less than zero comparison

From: Colin Ian King <colin.king@...onical.com>

vm_data->avic_vm_id is a u32, so the check for a error
return (less than zero) such as -EAGAIN from
avic_get_next_vm_id currently has no effect whatsoever.
Fix this by using a temporary int for the comparison
and assign vm_data->avic_vm_id to this. I used an explicit
u32 cast in the assignment to show why vm_data->avic_vm_id
cannot be used in the assign/compare steps.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/x86/kvm/svm.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1b66c5a..2ca66aa 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1419,7 +1419,7 @@ static void avic_vm_destroy(struct kvm *kvm)
 static int avic_vm_init(struct kvm *kvm)
 {
 	unsigned long flags;
-	int err = -ENOMEM;
+	int vm_id, err = -ENOMEM;
 	struct kvm_arch *vm_data = &kvm->arch;
 	struct page *p_page;
 	struct page *l_page;
@@ -1427,9 +1427,10 @@ static int avic_vm_init(struct kvm *kvm)
 	if (!avic)
 		return 0;
 
-	vm_data->avic_vm_id = avic_get_next_vm_id();
-	if (vm_data->avic_vm_id < 0)
-		return vm_data->avic_vm_id;
+	vm_id = avic_get_next_vm_id();
+	if (vm_id < 0)
+		return vm_id;
+	vm_data->avic_vm_id = (u32)vm_id;
 
 	/* Allocating physical APIC ID table (4KB) */
 	p_page = alloc_page(GFP_KERNEL);
-- 
2.9.3