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[media] v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned
The DMA transfer must be aligned to a specific value. If userptr is not aligned to DMA requirements then unexpected corruptions of the memory may occur before or after a buffer. To prevent such situations, all unligned userptr buffers are rejected at VIDIOC_QBUF. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -491,6 +491,18 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
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struct vm_area_struct *vma;
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struct sg_table *sgt;
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unsigned long contig_size;
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unsigned long dma_align = dma_get_cache_alignment();
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/* Only cache aligned DMA transfers are reliable */
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if (!IS_ALIGNED(vaddr | size, dma_align)) {
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pr_debug("user data must be aligned to %lu bytes\n", dma_align);
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return ERR_PTR(-EINVAL);
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}
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if (!size) {
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pr_debug("size is zero\n");
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return ERR_PTR(-EINVAL);
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}
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buf = kzalloc(sizeof *buf, GFP_KERNEL);
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if (!buf)
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