linux-kernel - [PATCH 6/7] iio: adc: stm32-dfsdm: add check on max filter id

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Date:   Fri, 23 Feb 2018 13:51:00 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <jic23@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <fabrice.gasnier@...com>,
        <linux-iio@...r.kernel.org>, <lars@...afoo.de>, <knaack.h@....de>,
        <pmeerw@...erw.net>, <benjamin.gaignard@...aro.org>,
        <arnaud.pouliquen@...com>
Subject: [PATCH 6/7] iio: adc: stm32-dfsdm: add check on max filter id

reg property should be checked against number of available filters.
BTW, dfsdm->num_fls wasn't used. But it can be used for this purpose.
This prevents using data out of allocated dfsdm->fl_list array.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
 drivers/iio/adc/stm32-dfsdm-adc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
index 57bcb45..1b78bec 100644
--- a/drivers/iio/adc/stm32-dfsdm-adc.c
+++ b/drivers/iio/adc/stm32-dfsdm-adc.c
@@ -1111,8 +1111,8 @@ static int stm32_dfsdm_adc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, adc);
 
 	ret = of_property_read_u32(dev->of_node, "reg", &adc->fl_id);
-	if (ret != 0) {
-		dev_err(dev, "Missing reg property\n");
+	if (ret != 0 || adc->fl_id >= adc->dfsdm->num_fls) {
+		dev_err(dev, "Missing or bad reg property\n");
 		return -EINVAL;
 	}
 
-- 
1.9.1