forked from Minki/linux
Blackfin arch: check pointers in safe_dma_memcpy
Check pointers in safe_dma_memcpy as this is the entry point for user-space code Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
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@ -596,11 +596,18 @@ void *dma_memcpy(void *dest, const void *src, size_t size)
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}
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EXPORT_SYMBOL(dma_memcpy);
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/**
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* safe_dma_memcpy - DMA memcpy w/argument checking
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*
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* Verify arguments are safe before heading to dma_memcpy().
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*/
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void *safe_dma_memcpy(void *dest, const void *src, size_t size)
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{
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void *addr;
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addr = dma_memcpy(dest, src, size);
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return addr;
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if (!access_ok(VERIFY_WRITE, dst, size))
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return NULL;
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if (!access_ok(VERIFY_READ, src, size))
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return NULL;
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return dma_memcpy(dst, src, size);
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}
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EXPORT_SYMBOL(safe_dma_memcpy);
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