Commit 49946e73 authored by Mike Frysinger's avatar Mike Frysinger Committed by Bryan Wu
Browse files

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: default avatarMike Frysinger <vapier.adi@gmail.com>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent c9e0020d

arch/blackfin/kernel/bfin_dma_5xx.c

+10 −3
Original line number Diff line number Diff line
@@ -596,11 +596,18 @@ void *dma_memcpy(void *dest, const void *src, size_t size) 
}

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 *addr;

	addr = dma_memcpy(dest, src, size);

	return addr;

	if (!access_ok(VERIFY_WRITE, dst, size))

		return NULL;

	if (!access_ok(VERIFY_READ, src, size))

		return NULL;

	return dma_memcpy(dst, src, size);

}

EXPORT_SYMBOL(safe_dma_memcpy);