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drivers: dma-removed: page align size on free

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Fix removed ops memory leak which occurs when non-page
aligned memory is freed.

On free we need to page align the amount of memory being
freed otherwise we risk rounding down the size of the
allocation to the page boundary which would leak one page.

Change-Id: Idabce39cad526eeaf073748edb227b2edd76f40e
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
This commit is contained in:
Liam Mark 2017-02-15 13:52:48 -08:00
parent a87081cfb8
commit ab2c3421d5
1 changed files with 2 additions and 1 deletions
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3
drivers/base/dma-removed.c
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@ -1,6 +1,6 @@
/*
*
* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
* Copyright (c) 2013-2017, The Linux Foundation. All rights reserved.
* Copyright (C) 2000-2004 Russell King
*
* This program is free software; you can redistribute it and/or modify
@ -294,6 +294,7 @@ void removed_free(struct device *dev, size_t size, void *cpu_addr,
bool no_kernel_mapping = attrs & DMA_ATTR_NO_KERNEL_MAPPING;
struct removed_region *dma_mem = dev->removed_mem;
size = PAGE_ALIGN(size);
if (!no_kernel_mapping)
iounmap(cpu_addr);
mutex_lock(&dma_mem->lock);