linux-kernel - [PATCH 4.14 030/496] KVM: s390: vsie: fix

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Date:   Mon, 28 May 2018 11:56:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        David Hildenbrand <david@...hat.com>
Subject: [PATCH 4.14 030/496] KVM: s390: vsie: fix < 8k check for the itdba

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: David Hildenbrand <david@...hat.com>

commit f4a551b72358facbbe5714248dff78404272feee upstream.

By missing an "L", we might detect some addresses to be <8k,
although they are not.

e.g. for itdba = 100001fff
!(gpa & ~0x1fffU) -> 1
!(gpa & ~0x1fffUL) -> 0

So we would report a SIE validity intercept although everything is fine.

Fixes: 166ecb3 ("KVM: s390: vsie: support transactional execution")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>
Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: David Hildenbrand <david@...hat.com>
Signed-off-by: Janosch Frank <frankja@...ux.ibm.com>
Cc: stable@...r.kernel.org # v4.8+
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/s390/kvm/vsie.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -590,7 +590,7 @@ static int pin_blocks(struct kvm_vcpu *v
 
 	gpa = READ_ONCE(scb_o->itdba) & ~0xffUL;
 	if (gpa && (scb_s->ecb & ECB_TE)) {
-		if (!(gpa & ~0x1fffU)) {
+		if (!(gpa & ~0x1fffUL)) {
 			rc = set_validity_icpt(scb_s, 0x0080U);
 			goto unpin;
 		}