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| author |   Dean Nelson <dnelson@redhat.com> | 2015-04-29 16:09:18 +0100 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2015-04-29 17:39:39 +0100 |
| commit | 2cff98b99c469880ce830cbcde015b53b67e0a7b (patch) | |
| tree | d661a5897d1c01ba80a980be63332a95dfb7cc61 /arch | |
| parent | arm64: dma-mapping: always clear allocated buffers (diff) | |
| download | linux-dev-2cff98b99c469880ce830cbcde015b53b67e0a7b.tar.xz linux-dev-2cff98b99c469880ce830cbcde015b53b67e0a7b.zip | |
arm64: add missing PAGE_ALIGN() to __dma_free()
__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.
Cc: stable@vger.kernel.org
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index e0f14ee26b68..b0bd4e5fd5cf 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -104,7 +104,6 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size, 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 *dev, size_t size, { 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; |