This is a note to let you know that I've just added the patch titled arm64: add missing PAGE_ALIGN() to __dma_free() to the 4.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-add-missing-page_align-to-__dma_free.patch and it can be found in the queue-4.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2cff98b99c469880ce830cbcde015b53b67e0a7b Mon Sep 17 00:00:00 2001 From: Dean Nelson <dnelson@xxxxxxxxxx> Date: Wed, 29 Apr 2015 16:09:18 +0100 Subject: arm64: add missing PAGE_ALIGN() to __dma_free() 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> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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; Patches currently in stable-queue which might be from dnelson@xxxxxxxxxx are queue-4.0/arm64-add-missing-page_align-to-__dma_free.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html