From cd8dd41a33264a4602539711f76670c2a1f4d007 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Thu, 17 Mar 2016 09:21:50 +0100 Subject: [PATCH] spi: imx: Fix possible NULL pointer deref transfer could be NULL in spi_imx_can_dma() when it's called from spi_imx_setupxfer() with a NULL transfer. Test for a NULL pointer before dereferencing it. Signed-off-by: Sascha Hauer Cc: Dan Carpenter Signed-off-by: Mark Brown --- drivers/spi/spi-imx.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index b79d70d6dabf..50769078e72e 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -211,11 +211,15 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); - unsigned int bpw = transfer->bits_per_word; + unsigned int bpw; if (!master->dma_rx) return false; + if (!transfer) + return false; + + bpw = transfer->bits_per_word; if (!bpw) bpw = spi->bits_per_word;