From: David Hildenbrand <dahi@linux.vnet.ibm.com>
Date: Thu, 12 May 2016 12:07:05 +0000 (+0200)
Subject: KVM: s390: pfmf: handle address overflows
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=695be0e7a24a8875c347437566f2c44ba673580b;p=linux-beck.git

KVM: s390: pfmf: handle address overflows

In theory, end could always end up being < start, if overflowing to 0.
Although very unlikely for now, let's just fix it.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 752a1ac1aab6..b8327b8fdb8f 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -715,7 +715,7 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 	}
 
-	while (start < end) {
+	while (start != end) {
 		unsigned long useraddr;
 
 		/* Translate guest address to host address */