| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.0 40/72] arm64: add missing PAGE_ALIGN() to __dma_free() | Date | Mon, 11 May 2015 10:54:46 -0700 |
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4.0-stable review patch. If anyone has any objections, please let me know.
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From: Dean Nelson <dnelson@redhat.com>
commit 2cff98b99c469880ce830cbcde015b53b67e0a7b upstream.
__dma_alloc() does a PAGE_ALIGN() on the passed in size argument before doing anything else. __dma_free() does not. And because it doesn't, it is possible to leak memory should size not be an integer multiple of PAGE_SIZE.
The solution is to add a PAGE_ALIGN() to __dma_free() like is done in __dma_alloc().
Additionally, this patch removes a redundant PAGE_ALIGN() from __dma_alloc_coherent(), since __dma_alloc_coherent() can only be called from __dma_alloc(), which already does a PAGE_ALIGN() before the call.
Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Dean Nelson <dnelson@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm64/mm/dma-mapping.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -104,7 +104,6 @@ static void *__dma_alloc_coherent(struct struct page *page; void *addr; - size = PAGE_ALIGN(size); page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, get_order(size)); if (!page) @@ -193,6 +192,8 @@ static void __dma_free(struct device *de { void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle)); + size = PAGE_ALIGN(size); + if (!is_device_dma_coherent(dev)) { if (__free_from_pool(vaddr, size)) return;
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