From d3bb7858545fa54ff3c591570f1d36234ecde2bf Mon Sep 17 00:00:00 2001 From: Patrick Delaunay Date: Fri, 3 Aug 2018 13:38:43 +0200 Subject: [PATCH] serial: protect access to serial rx buffer Add test to avoid access to rx buffer when this buffer is empty. In this case directly call getc() function to avoid issue when tstc() is not called. Signed-off-by: Patrick Delaunay Reviewed-by: Simon Glass --- drivers/serial/serial-uclass.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index 321d23ee93..4121a37aa8 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -228,6 +228,9 @@ static int _serial_getc(struct udevice *dev) struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); char val; + if (upriv->rd_ptr == upriv->wr_ptr) + return __serial_getc(dev); + val = upriv->buf[upriv->rd_ptr++]; upriv->rd_ptr %= CONFIG_SERIAL_RX_BUFFER_SIZE; -- 2.25.1