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KVM: s390: Fix STHYI buffer alignment for diag224 

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.

Cc: stable@vger.kernel.org # v4.8+
Reported-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2016-10-26 08:48:11 +02:00 committed by Christian Borntraeger
parent a5efb6b6c9
commit 45c7ee43a5
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kvm/sthyi.c
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@ -315,7 +315,7 @@ static void fill_diag(struct sthyi_sctns *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)
sctns->par.infpval1 |= PAR_WGHT_VLD;
out:
kfree(diag224_buf);
free_page((unsigned long)diag224_buf);
vfree(diag204_buf);
}