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spi: Fix NULL pointer when setting SPI_CS_HIGH for GPIO CS

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Even if the flag use_gpio_descriptors is set, it is possible that
cs_gpiods was not allocated, which leads to a kernel crash.

Reported-by: "kernelci.org bot" <bot@kernelci.org>
Fixes: 3e5ec1db8b ("spi: Fix SPI_CS_HIGH setting when using native and GPIO CS")
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191024141309.22434-1-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: <stable@vger.kernel.org>
This commit is contained in:
Gregory CLEMENT 2019-10-24 16:13:09 +02:00 committed by Mark Brown
parent 77c544d243
commit 15f794bd97
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GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 1 deletions
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3
drivers/spi/spi.c
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@ -1780,7 +1780,8 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
* handled in the gpiolib, so all gpio chip selects are "active high" * handled in the gpiolib, so all gpio chip selects are "active high"
* in the logical sense, the gpiolib will invert the line if need be. * in the logical sense, the gpiolib will invert the line if need be.
*/ */
if ((ctlr->use_gpio_descriptors) && ctlr->cs_gpiods[spi->chip_select]) if ((ctlr->use_gpio_descriptors) && ctlr->cs_gpiods &&
ctlr->cs_gpiods[spi->chip_select])
spi->mode |= SPI_CS_HIGH; spi->mode |= SPI_CS_HIGH;
/* Device speed */ /* Device speed */