From 5c1a87de58092b5a17c20b6debfccaa6cf677fde Mon Sep 17 00:00:00 2001 From: Stefan Mavrodiev Date: Wed, 5 Dec 2018 14:27:57 +0200 Subject: [PATCH] spi: sun4i: Add rx_buf NULL pointer check 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 Acked-by: Jagan Teki [jagan: fix commit message] Signed-off-by: Jagan Teki --- 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; } } -- 2.39.2