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ARM: 8426/1: dma-mapping: add missing range check in dma_mmap()

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dma_mmap() function in IOMMU-based dma-mapping implementation lacked
a check for valid range of mmap parameters (offset and buffer size), what
might have caused access beyond the allocated buffer. This patch fixes
this issue.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: stable@vger.kernel.org  # v3.6+
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Marek Szyprowski 2015-08-28 09:41:39 +01:00 committed by Russell King
parent db695c0509
commit 371f0f085f
1 changed files with 5 additions and 0 deletions
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5
arch/arm/mm/dma-mapping.c
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@ -1407,12 +1407,17 @@ static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
unsigned long uaddr = vma->vm_start;
unsigned long usize = vma->vm_end - vma->vm_start;
struct page **pages = __iommu_get_pages(cpu_addr, attrs);
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
if (!pages)
return -ENXIO;
if (off >= nr_pages || (usize >> PAGE_SHIFT) > nr_pages - off)
return -ENXIO;
do {
int ret = vm_insert_page(vma, uaddr, *pages++);
if (ret) {