linux-kernel - [PATCH 47/91] KVM: s390: check cpu

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Message-Id: <20120205220951.461594058@pcw.home.local>
Date:	Sun, 05 Feb 2012 23:10:36 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 47/91] KVM: s390: check cpu_id prior to using it

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

commit 4d47555a80495657161a7e71ec3014ff2021e450 upstream.

We use the cpu id provided by userspace as array index here. Thus we
clearly need to check it first. Ooops.

Signed-off-by: Carsten Otte <cotte@...ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 arch/s390/kvm/kvm-s390.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

Index: longterm-2.6.27/arch/s390/kvm/kvm-s390.c
===================================================================
--- longterm-2.6.27.orig/arch/s390/kvm/kvm-s390.c	2012-02-05 22:34:33.588915140 +0100
+++ longterm-2.6.27/arch/s390/kvm/kvm-s390.c	2012-02-05 22:34:41.524915249 +0100
@@ -274,11 +274,17 @@
 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
 				      unsigned int id)
 {
-	struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
-	int rc = -ENOMEM;
+	struct kvm_vcpu *vcpu;
+	int rc = -EINVAL;
 
+	if (id >= KVM_MAX_VCPUS)
+		goto out;
+
+	rc = -ENOMEM;
+
+	vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
 	if (!vcpu)
-		goto out_nomem;
+		goto out;
 
 	vcpu->arch.sie_block = (struct kvm_s390_sie_block *)
 					get_zeroed_page(GFP_KERNEL);
@@ -313,7 +319,7 @@
 	return vcpu;
 out_free_cpu:
 	kfree(vcpu);
-out_nomem:
+out:
 	return ERR_PTR(rc);
 }
 


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