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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     Alexey Kardashevskiy <aik@ozlabs.ru>,
        Alex Williamson <alex.williamson@redhat.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.9 155/219] vfio/spapr_tce: Check kzalloc()
 return when preregistering memory
Thread-Topic: [PATCH AUTOSEL for 4.9 155/219] vfio/spapr_tce: Check kzalloc()
 return when preregistering memory
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Date:   Sat, 3 Mar 2018 22:29:26 +0000
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From: Alexey Kardashevskiy <aik@ozlabs.ru>

[ Upstream commit 3393af24b665cb0aea7353b05e522b03ab1e7d73 ]

This adds missing checking for kzalloc() return value.

Fixes: 4b6fad7097f8 ("powerpc/mm/iommu, vfio/spapr: Put pages on VFIO conta=
iner shutdown")
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/vfio/vfio_iommu_spapr_tce.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_=
spapr_tce.c
index 87ad0d72d8a9..70c748a5fbcc 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -195,6 +195,11 @@ static long tce_iommu_register_pages(struct tce_contai=
ner *container,
 		return ret;
=20
 	tcemem =3D kzalloc(sizeof(*tcemem), GFP_KERNEL);
+	if (!tcemem) {
+		mm_iommu_put(container->mm, mem);
+		return -ENOMEM;
+	}
+
 	tcemem->mem =3D mem;
 	list_add(&tcemem->next, &container->prereg_list);
=20
--=20
2.14.1