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iio: adc: stm32-adc: harden against NULL pointer deref in stm32_adc_probe()

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[ Upstream commit 3a23b384e7 ]

of_match_device() may fail and returns a NULL pointer.

In practice there is no known reasonable way to trigger this, but
in case one is added in future, harden the code by adding the check

Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Link: https://lore.kernel.org/r/tencent_994DA85912C937E3B5405BA960B31ED90A08@qq.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Shurong 2023-07-15 23:55:50 +08:00 committed by Greg Kroah-Hartman
parent 6b1e61f7d0
commit 5b82e42405
1 changed files with 7 additions and 2 deletions
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9
drivers/iio/adc/stm32-adc-core.c
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@ -708,6 +708,8 @@ static int stm32_adc_probe(struct platform_device *pdev)
struct stm32_adc_priv *priv;
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *of_id;
struct resource *res;
u32 max_rate;
int ret;
@ -720,8 +722,11 @@ static int stm32_adc_probe(struct platform_device *pdev)
return -ENOMEM;
platform_set_drvdata(pdev, &priv->common);
priv->cfg = (const struct stm32_adc_priv_cfg *)
of_match_device(dev->driver->of_match_table, dev)->data;
of_id = of_match_device(dev->driver->of_match_table, dev);
if (!of_id)
return -ENODEV;
priv->cfg = (const struct stm32_adc_priv_cfg *)of_id->data;
priv->nb_adc_max = priv->cfg->num_adcs;
spin_lock_init(&priv->common.lock);