linux-kernel - [PATCH 3.19.y-ckt 90/92] arm64: add missing PAGE_ALIGN() to __dma

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Message-Id: <1432654896-28478-91-git-send-email-kamal@canonical.com>
Date:	Tue, 26 May 2015 08:41:34 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dean Nelson <dnelson@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 90/92] arm64: add missing PAGE_ALIGN() to __dma_free()

3.19.8-ckt1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dean Nelson <dnelson@...hat.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@....com>
Signed-off-by: Dean Nelson <dnelson@...hat.com>
Signed-off-by: Will Deacon <will.deacon@....com>
[ Dean Nelson: backport to 3.19-stable ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 6efbb52..7980c2a 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -133,7 +133,7 @@ static void __dma_free_coherent(struct device *dev, size_t size,
 
 	freed = dma_release_from_contiguous(dev,
 					phys_to_page(paddr),
-					size >> PAGE_SHIFT);
+					PAGE_ALIGN(size) >> PAGE_SHIFT);
 	if (!freed)
 		swiotlb_free_coherent(dev, size, vaddr, dma_handle);
 }
@@ -189,6 +189,8 @@ 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);
+
 	if (__free_from_pool(vaddr, size))
 		return;
 	vunmap(vaddr);
-- 
1.9.1

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