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dma-debug: fix memory leak in debug_dma_alloc_coherent

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Marty reported a memory leakage introduced by commit 3aaabbf1c3
("lib/dma-debug.c: fix incorrect pfn calculation"). Fix it
by checking the virtual address before allocating the entry.

This patch also use virt_addr_valid() instead of virt_to_page()
to check if a virtual address is linear.

Fixes: 3aaabbf1 ("lib/dma-debug.c: fix incorrect pfn calculation")
Reported-by: Marty Faltesek <mfaltesek@google.com>
Signed-off-by: Miles Chen <miles.chen@mediatek.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Miles Chen 2018-02-22 19:22:20 +08:00 committed by Christoph Hellwig
parent a638af00b2
commit af1da68684
1 changed files with 5 additions and 5 deletions
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10
lib/dma-debug.c
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@ -1491,12 +1491,12 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size,
if (unlikely(virt == NULL))
return;
entry = dma_entry_alloc();
if (!entry)
/* handle vmalloc and linear addresses */
if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
return;
/* handle vmalloc and linear addresses */
if (!is_vmalloc_addr(virt) && !virt_to_page(virt))
entry = dma_entry_alloc();
if (!entry)
return;
entry->type = dma_debug_coherent;
@ -1528,7 +1528,7 @@ void debug_dma_free_coherent(struct device *dev, size_t size,
};
/* handle vmalloc and linear addresses */
if (!is_vmalloc_addr(virt) && !virt_to_page(virt))
if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
return;
if (is_vmalloc_addr(virt))