3.16.7-ckt13 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Dean Nelson <dnelson@xxxxxxxxxx>
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@xxxxxxx>
Signed-off-by: Dean Nelson <dnelson@xxxxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
[ luis: backported to 3.16: based on Dean's 3.19 backport ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
arch/arm64/mm/dma-mapping.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 893802645efe..0ada77e5d9e7 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -86,7 +86,7 @@ static void __dma_free_coherent(struct device *dev, size_t size,
dma_release_from_contiguous(dev,
phys_to_page(paddr),
- size >> PAGE_SHIFT);
+ PAGE_ALIGN(size) >> PAGE_SHIFT);
} else {
swiotlb_free_coherent(dev, size, vaddr, dma_handle);
}
@@ -138,6 +138,8 @@ static void __dma_free_noncoherent(struct device *dev, size_t size,
{
void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
+ size = PAGE_ALIGN(size);
+
vunmap(vaddr);
__dma_free_coherent(dev, size, swiotlb_addr, dma_handle, attrs);
}
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