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Blackfin arch: check pointers in safe_dma_memcpy

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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>
This commit is contained in:
Mike Frysinger 2009-01-07 23:14:38 +08:00 committed by Bryan Wu
parent c9e0020d49
commit 49946e7329
1 changed files with 10 additions and 3 deletions
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13
arch/blackfin/kernel/bfin_dma_5xx.c
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@ -596,11 +596,18 @@ void *dma_memcpy(void *dest, const void *src, size_t size)
} }
EXPORT_SYMBOL(dma_memcpy); EXPORT_SYMBOL(dma_memcpy);
/**
* safe_dma_memcpy - DMA memcpy w/argument checking
*
* Verify arguments are safe before heading to dma_memcpy().
*/
void *safe_dma_memcpy(void *dest, const void *src, size_t size) void *safe_dma_memcpy(void *dest, const void *src, size_t size)
{ {
void *addr; if (!access_ok(VERIFY_WRITE, dst, size))
addr = dma_memcpy(dest, src, size); return NULL;
return addr; if (!access_ok(VERIFY_READ, src, size))
return NULL;
return dma_memcpy(dst, src, size);
} }
EXPORT_SYMBOL(safe_dma_memcpy); EXPORT_SYMBOL(safe_dma_memcpy);