linux-kernel - [PATCH 4.8 069/138] KVM: s390: Fix STHYI buffer alignment for diag224

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Message-Id: <20161109102847.987786217@linuxfoundation.org>
Date:   Wed,  9 Nov 2016 11:45:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
        Janosch Frank <frankja@...ux.vnet.ibm.com>,
        Cornelia Huck <cornelia.huck@...ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH 4.8 069/138] KVM: s390: Fix STHYI buffer alignment for diag224

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

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

From: Janosch Frank <frankja@...ux.vnet.ibm.com>

commit 45c7ee43a5184ddbff652ee0d2e826f86f1b616b upstream.

Diag224 requires a page-aligned 4k buffer to store the name table
into. kmalloc does not guarantee page alignment, hence we replace it
with __get_free_page for the buffer allocation.

Reported-by: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Signed-off-by: Janosch Frank <frankja@...ux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@...ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/s390/kvm/sthyi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/s390/kvm/sthyi.c
+++ b/arch/s390/kvm/sthyi.c
@@ -315,7 +315,7 @@ static void fill_diag(struct sthyi_sctns
 	if (r < 0)
 		goto out;
 
-	diag224_buf = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+	diag224_buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
 	if (!diag224_buf || diag224(diag224_buf))
 		goto out;
 
@@ -378,7 +378,7 @@ static void fill_diag(struct sthyi_sctns
 	sctns->par.infpval1 |= PAR_WGHT_VLD;
 
 out:
-	kfree(diag224_buf);
+	free_page((unsigned long)diag224_buf);
 	vfree(diag204_buf);
 }