Messages in this thread Patch in this message | | | From | Yue Haibing <> | Subject | [PATCH] ARM: dma-mapping: always clear allocated buffers in __alloc_from_pool | Date | Tue, 12 Mar 2019 17:16:37 +0800 |
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From: YueHaibing <yuehaibing@huawei.com>
Like commit 518a2f1925c3 ("dma-mapping: zero memory returned from dma_alloc_*"), if we want to map memory from the DMA allocator to userspace it must be zeroed at allocation time to prevent stale data leaks. On arm platform, if the allocator is pool_allocator in __dma_alloc, then the mem is alloced by __alloc_from_pool, which also need be zeroed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com> --- arch/arm/mm/dma-mapping.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 8a90f29..28ad6d5 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -558,6 +558,7 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page) *ret_page = phys_to_page(phys); ptr = (void *)val; + memset(ptr, 0, size); } return ptr; -- 2.7.0
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