--- a/drivers/dma-buf/udmabuf.c
+++ u/drivers/dma-buf/udmabuf.c
@@ -127,8 +127,11 @@ static int begin_cpu_udmabuf(struct dma_
 
 	if (!ubuf->sg) {
 		ubuf->sg = get_sg_table(dev, buf, direction);
-		if (IS_ERR(ubuf->sg))
-			return PTR_ERR(ubuf->sg);
+		if (IS_ERR(ubuf->sg)) {
+			int err = PTR_ERR(ubuf->sg);
+			ubuf->sg = NULL;
+			return err;
+		}
 	} else {
 		dma_sync_sg_for_cpu(dev, ubuf->sg->sgl, ubuf->sg->nents,
 				    direction);