1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index e508939daea3..21d01a491405 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -80,6 +80,10 @@ int serial8250_tx_dma(struct uart_8250_port *p)
                 return 0;
 
         dma->tx_size = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
+        if (dma->tx_size < p->port.fifosize) {
+                ret = -EINVAL;
+                goto err;
+        }
 
         desc = dmaengine_prep_slave_single(dma->txchan,
                                            dma->tx_addr + xmit->tail,