drm/exynos: Add NULL pointer check

devm_kzalloc can fail. Hence check the pointer to avoid NULL pointer
dereferencing.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
index 3799d5c2b5df..fb8db0378274 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
@@ -47,10 +47,16 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev)
 
         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
                                         GFP_KERNEL);
+        if (!dev->dma_parms)
+                goto error;
+
         dma_set_max_seg_size(dev, 0xffffffffu);
         dev->archdata.mapping = mapping;
 
         return 0;
+error:
+        arm_iommu_release_mapping(mapping);
+        return -ENOMEM;
 }
 
 /*
@@ -91,6 +97,9 @@ int drm_iommu_attach_device(struct drm_device *drm_dev,
         subdrv_dev->dma_parms = devm_kzalloc(subdrv_dev,
                                         sizeof(*subdrv_dev->dma_parms),
                                         GFP_KERNEL);
+        if (!subdrv_dev->dma_parms)
+                return -ENOMEM;
+
         dma_set_max_seg_size(subdrv_dev, 0xffffffffu);
 
         ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping);