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Commit 4db7fcdf authored by Sachin Kamat's avatar Sachin Kamat Committed by Inki Dae
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drm/exynos: Add NULL pointer check 



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

Signed-off-by: default avatarSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: default avatarInki Dae <inki.dae@samsung.com>
parent 38bb5253

drivers/gpu/drm/exynos/exynos_drm_iommu.c

+9 −0
Original line number Diff line number Diff line
@@ -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);