diff --git a/kernel/dma-coherent.c b/kernel/dma-coherent.c
index 8056d081609caacd13b26e3dceedd6b07cd5550e..038707404b76075866d6bccb5df015d9965762c4 100644
--- a/kernel/dma-coherent.c
+++ b/kernel/dma-coherent.c
@@ -118,6 +118,8 @@ int dma_alloc_from_coherent(struct device *dev, ssize_t size,
 	mem = dev->dma_mem;
 	if (!mem)
 		return 0;
+	if (unlikely(size > mem->size))
+ 		return 0;
 
 	pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
 	if (pageno >= 0) {