[PATCH 4.9 32/56] tty: atmel_serial: fix a potential NULL pointer dereference

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kangjie Lu <k...@umn.edu>

commit c85be041065c0be8bc48eda4c45e0319caf1d0e5 upstream.

In case dmaengine_prep_dma_cyclic fails, the fix returns a proper
error code to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <k...@umn.edu>
Fixes: 34df42f59a60 ("serial: at91: add rx dma support")
Acked-by: Richard Genoud <richard.gen...@gmail.com>
Cc: stable <sta...@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/tty/serial/atmel_serial.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1166,6 +1166,10 @@ static int atmel_prepare_rx_dma(struct u
                                         sg_dma_len(&atmel_port->sg_rx)/2,
                                         DMA_DEV_TO_MEM,
                                         DMA_PREP_INTERRUPT);
+       if (!desc) {
+               dev_err(port->dev, "Preparing DMA cyclic failed\n");
+               goto chan_err;
+       }
        desc->callback = atmel_complete_rx_dma;
        desc->callback_param = port;
        atmel_port->desc_rx = desc;