diff options
| -rw-r--r-- | arch/blackfin/kernel/bfin_dma_5xx.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/blackfin/kernel/bfin_dma_5xx.c b/arch/blackfin/kernel/bfin_dma_5xx.c index 36f78c1648b..bafb6aea0bc 100644 --- a/arch/blackfin/kernel/bfin_dma_5xx.c +++ b/arch/blackfin/kernel/bfin_dma_5xx.c @@ -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); |