patch "iio: adc: meson-saradc: fix potential crash in" added to staging-linus

This is a note to let you know that I've just added the patch titled

iio: adc: meson-saradc: fix potential crash in

to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Martin Blumenstingl <[email protected]>
Date: Sun, 4 Jun 2017 15:28:23 +0200
Subject: iio: adc: meson-saradc: fix potential crash in
meson_sar_adc_clear_fifo

meson_sar_adc_clear_fifo passes a 0 as value-pointer to regmap_read(). In case of the meson-saradc driver this ends up in regmap_mmio_read(), where the value-pointer is de-referenced unconditionally to assign the value which was read.
Fix this by passing an actual pointer, even though all we want to do is to discard the value.

As a side-effect this fixes a sparse warning ("Using plain integer as NULL pointer") as reported by Paolo Cretaro.

---
 drivers/iio/adc/meson_saradc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index dd4190b50df6..6066bbfc42fe 100644
@@ -468,13 +468,13 @@ static void meson_sar_adc_unlock(struct iio_dev *indio_dev)
 static void meson_sar_adc_clear_fifo(struct iio_dev *indio_dev)
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
-	int count;
+	unsigned int count, tmp;
 
 	for (count = 0; count < MESON_SAR_ADC_MAX_FIFO_SIZE; count++) {
 		if (!meson_sar_adc_get_fifo_count(indio_dev))
 			break;
 
-		regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, 0);
+		regmap_read(priv->regmap, MESON_SAR_ADC_FIFO_RD, &tmp);
 	}
 }
 

2.13.1