Re: [RFC v1 3/4] vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova_pfn

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On 07/02/2019 04:45 AM, Cornelia Huck wrote:
On Mon,  1 Jul 2019 12:23:45 -0400
Farhan Ali <alifm@xxxxxxxxxxxxx> wrote:

So we clean up correctly.

Signed-off-by: Farhan Ali <alifm@xxxxxxxxxxxxx>
---
  drivers/s390/cio/vfio_ccw_cp.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index cab1be9..c5655de 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -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;

This looks like an older error -- can you give a Fixes: tag? (Yeah, I
know I sound like a broken record wrt that tag... :)

Yes, this is an older error. And yup I will add a fixes tag :)




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