diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2015-08-28 09:41:39 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-10-03 16:36:45 +0100 |
| commit | 371f0f085f629fc0f66695f572373ca4445a67ad (patch) | |
| tree | 502ee1051eeaf183b6581739a77880635cd4c62e /arch/arm/mm/dma-mapping.c | |
| parent | db695c0509d6ec9046ee5e4c520a19fa17d9fce2 (diff) | |
ARM: 8426/1: dma-mapping: add missing range check in dma_mmap()
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>
Diffstat (limited to 'arch/arm/mm/dma-mapping.c')
| -rw-r--r-- | arch/arm/mm/dma-mapping.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 1a7815e5421b..c0865867ef0d 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -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) { |