From 3393af24b665cb0aea7353b05e522b03ab1e7d73 Mon Sep 17 00:00:00 2001
From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Mon, 27 Mar 2017 14:23:40 +1100
Subject: [PATCH] vfio/spapr_tce: Check kzalloc() return when preregistering
 memory

This adds missing checking for kzalloc() return value.

Fixes: 4b6fad7097f8 ("powerpc/mm/iommu, vfio/spapr: Put pages on VFIO container 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>
---
 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 a7d811524092..78dca1aa6410 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -198,6 +198,11 @@ static long tce_iommu_register_pages(struct tce_container *container,
 		return ret;
 
 	tcemem = kzalloc(sizeof(*tcemem), GFP_KERNEL);
+	if (!tcemem) {
+		mm_iommu_put(container->mm, mem);
+		return -ENOMEM;
+	}
+
 	tcemem->mem = mem;
 	list_add(&tcemem->next, &container->prereg_list);
 
-- 
2.39.5