[PATCH] IOMMU: iommu module do not check NULL return of kmem_cache_zalloc

[Zhouyi Zhou]

From: Zhouyi Zhou <yizhouzhou@xxxxxxxxx>

The function iopte_alloc do not check NULL return of kmem_cache_zalloc,
call iopte_free with argument 0 will panic.

Signed-off-by: Zhouyi Zhou <yizhouzhou@xxxxxxxxx>
---
 drivers/iommu/omap-iommu.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index bcd78a7..5155714 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -551,7 +551,8 @@ static u32 *iopte_alloc(struct omap_iommu *obj, u32 *iopgd, u32 da)
 		dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
 	} else {
 		/* We raced, free the reduniovant table */
-		iopte_free(iopte);
+		if (iopte)
+			iopte_free(iopte);
 	}
 
 pte_ready:
-- 
1.7.10.4

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