[U-Boot] [PATCH 1/1] arm: sunxi: Add NULL pointer check

[Stefan Mavrodiev]

Current driver doesn't check if the destination pointer is NULL.
This cause the data from the FIFO to be stored inside the internal
SDRAM ( address 0 ).

The patch add simple check if the destination pointer is NULL.

Signed-off-by: Stefan Mavrodiev <stefan at olimex.com>
---
 drivers/spi/sun4i_spi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/sun4i_spi.c b/drivers/spi/sun4i_spi.c
index b86b5a00ad..38cc743c61 100644
--- a/drivers/spi/sun4i_spi.c
+++ b/drivers/spi/sun4i_spi.c
@@ -129,7 +129,8 @@ static inline void sun4i_spi_drain_fifo(struct sun4i_spi_priv *priv, int len)
 
 	while (len--) {
 		byte = readb(&priv->regs->rxdata);
-		*priv->rx_buf++ = byte;
+		if (priv->rx_buf)
+			*priv->rx_buf++ = byte;
 	}
 }
 
-- 
2.17.1