From: Avi Kivity <avi@redhat.com>
Date: Mon, 8 Jun 2009 12:55:21 +0000 (+0300)
Subject: KVM: Prevent overflow in largepages calculation
X-Git-Tag: v2.6.30.1~104
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=83efa8edb43ad69a5f801334170d41557cdca89b;p=thirdparty%2Fkernel%2Fstable.git

KVM: Prevent overflow in largepages calculation

commit 09f8ca74ae6c2d78b2c7f6c0751ed0cbe815a3d9 upstream.

If userspace specifies a memory slot that is larger than 8 petabytes, it
could overflow the largepages variable.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cf4bdc97faa49..acef475277119 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -920,8 +920,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
 	int r;
 	gfn_t base_gfn;
 	unsigned long npages, ugfn;
-	int largepages;
-	unsigned long i;
+	unsigned long largepages, i;
 	struct kvm_memory_slot *memslot;
 	struct kvm_memory_slot old, new;