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-Url: https://git.stricted.de/?a=commitdiff_plain;h=09f8ca74ae6c2d78b2c7f6c0751ed0cbe815a3d9;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

KVM: Prevent overflow in largepages calculation

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

Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5f865ed4c43..e21194566b7 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1087,8 +1087,7 @@ 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;