Merge "iommu: dma-mapping-fast: Add a check for count in fast_smmu_alloc"

/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.

/* Copyright (c) 2016-2019, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

	av8l_fast_iopte *ptep;

	unsigned long flags;

	struct sg_mapping_iter miter;

	unsigned int count = ALIGN(size, SZ_4K) >> PAGE_SHIFT;

	size_t count = ALIGN(size, SZ_4K) >> PAGE_SHIFT;

	int prot = IOMMU_READ | IOMMU_WRITE; /* TODO: extract from attrs */

	bool is_coherent = is_dma_coherent(dev, attrs);

	pgprot_t remap_prot = __get_dma_pgprot(attrs, PAGE_KERNEL, is_coherent);

	struct page **pages;

	/*

	 * sg_alloc_table_from_pages accepts unsigned int value for count

	 * so check count doesn't exceed UINT_MAX.

	 */

	if (count > UINT_MAX) {

		dev_err(dev, "count: %zx exceeds UNIT_MAX\n", count);

		return NULL;

	}

	prot = __get_iommu_pgprot(attrs, prot, is_coherent);

	*handle = DMA_ERROR_CODE;