On Mon, 18 Mar 2019, Aditya Pakki wrote:
> of_match_device can return NULL if no matching device is found. The patches
> avoids a scenario causing null pointer dereference.
>
> Signed-off-by: Aditya Pakki <[email protected]>
> ---
> drivers/mfd/mc13xxx-i2c.c | 2 ++
> drivers/mfd/mc13xxx-spi.c | 2 ++
> 2 files changed, 4 insertions(+)
>
> diff --git a/drivers/mfd/mc13xxx-i2c.c b/drivers/mfd/mc13xxx-i2c.c
> index 67e4c9aa7d18..1fbc9713bb9a 100644
> --- a/drivers/mfd/mc13xxx-i2c.c
> +++ b/drivers/mfd/mc13xxx-i2c.c
> @@ -80,6 +80,8 @@ static int mc13xxx_i2c_probe(struct i2c_client *client,
> if (client->dev.of_node) {
> const struct of_device_id *of_id =
> of_match_device(mc13xxx_dt_ids, &client->dev);
> + if (!of_id)
> + return -ENODEV;
Are you sure this can happen?
I don't think this is possible if client->dev.of_node is non-NULL.
The 'if (client->dev.of_node)' above should see to that.
> mc13xxx->variant = of_id->data;
> } else {
> mc13xxx->variant = (void *)id->driver_data;
> diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c
> index ee3411cc5ce4..c044a02bdb64 100644
> --- a/drivers/mfd/mc13xxx-spi.c
> +++ b/drivers/mfd/mc13xxx-spi.c
> @@ -158,6 +158,8 @@ static int mc13xxx_spi_probe(struct spi_device *spi)
> if (spi->dev.of_node) {
> const struct of_device_id *of_id =
> of_match_device(mc13xxx_dt_ids, &spi->dev);
> + if (!of_id)
> + return -ENODEV;
>
> mc13xxx->variant = of_id->data;
> } else {
--
Lee Jones [李琼斯]
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