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vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova_pfn

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So we don't call try to call vfio_unpin_pages() incorrectly.

Fixes: 0a19e61e6d4c ("vfio: ccw: introduce channel program interfaces")
Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <33a89467ad6369196ae6edf820cbcb1e2d8d050c.1562854091.git.alifm@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Farhan Ali 2019-07-11 10:28:53 -04:00 committed by Cornelia Huck
parent 8b515be512
commit c1ab69268d
1 changed files with 3 additions and 1 deletions
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4
drivers/s390/cio/vfio_ccw_cp.c
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@ -72,8 +72,10 @@ static int pfn_array_alloc(struct pfn_array *pa, u64 iova, unsigned int len)
sizeof(*pa->pa_iova_pfn) +
sizeof(*pa->pa_pfn),
GFP_KERNEL);
if (unlikely(!pa->pa_iova_pfn))
if (unlikely(!pa->pa_iova_pfn)) {
pa->pa_nr = 0;
return -ENOMEM;
}
pa->pa_pfn = pa->pa_iova_pfn + pa->pa_nr;
pa->pa_iova_pfn[0] = pa->pa_iova >> PAGE_SHIFT;