linux-kernel - [PATCH 4.19 34/91] vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova

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Date:   Wed, 14 Aug 2019 19:00:57 +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, Farhan Ali <alifm@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 34/91] vfio-ccw: Set pa_nr to 0 if memory allocation fails for pa_iova_pfn

[ Upstream commit c1ab69268d124ebdbb3864580808188ccd3ea355 ]

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@...ux.ibm.com>
Reviewed-by: Eric Farman <farman@...ux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@...hat.com>
Message-Id: <33a89467ad6369196ae6edf820cbcb1e2d8d050c.1562854091.git.alifm@...ux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 70a006ba4d050..4fe06ff7b2c8b 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -89,8 +89,10 @@ static int pfn_array_alloc_pin(struct pfn_array *pa, struct device *mdev,
 				  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;
-- 
2.20.1