[PATCH] spi: coldfire-qspi: Prevent NULL pointer dereference

[Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>]

If pdata->cs_control is NULL, we will hit NULL pointer dereference in
mcfqspi_cs_select() and mcfqspi_cs_deselect(). Thus add NULL test for
pdata->cs_control in probe().

Signed-off-by: Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>
---
 drivers/spi/spi-coldfire-qspi.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-coldfire-qspi.c b/drivers/spi/spi-coldfire-qspi.c
index c29bbb0..b01616c 100644
--- a/drivers/spi/spi-coldfire-qspi.c
+++ b/drivers/spi/spi-coldfire-qspi.c
@@ -133,13 +133,13 @@ static void mcfqspi_cs_deselect(struct mcfqspi *mcfqspi, u8 chip_select,
 
 static int mcfqspi_cs_setup(struct mcfqspi *mcfqspi)
 {
-	return (mcfqspi->cs_control && mcfqspi->cs_control->setup) ?
+	return (mcfqspi->cs_control->setup) ?
 		mcfqspi->cs_control->setup(mcfqspi->cs_control) : 0;
 }
 
 static void mcfqspi_cs_teardown(struct mcfqspi *mcfqspi)
 {
-	if (mcfqspi->cs_control && mcfqspi->cs_control->teardown)
+	if (mcfqspi->cs_control->teardown)
 		mcfqspi->cs_control->teardown(mcfqspi->cs_control);
 }
 
@@ -366,6 +366,11 @@ static int mcfqspi_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
+	if (!pdata->cs_control) {
+		dev_dbg(&pdev->dev, "pdata->cs_control is NULL\n");
+		return -EINVAL;
+	}
+
 	master = spi_alloc_master(&pdev->dev, sizeof(*mcfqspi));
 	if (master == NULL) {
 		dev_dbg(&pdev->dev, "spi_alloc_master failed\n");
-- 
1.8.1.2



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