Re: [PATCH 4/9] i2c: qcom-cci: don't put a device tree node before i2c_add_adapter()

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On Thu, 3 Feb 2022 at 17:47, Vladimir Zapolskiy
<vladimir.zapolskiy@xxxxxxxxxx> wrote:
>
> There is a minor chance for a race, if a pointer to an i2c-bus subnode
> is stored and then reused after releasing its reference, and it would
> be sufficient to get one more reference under a loop over children
> subnodes.
>
> Fixes: e517526195de ("i2c: Add Qualcomm CCI I2C driver")
> Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@xxxxxxxxxx>
> ---
>  drivers/i2c/busses/i2c-qcom-cci.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-qcom-cci.c b/drivers/i2c/busses/i2c-qcom-cci.c
> index fd4260d18577..cf54f1cb4c57 100644
> --- a/drivers/i2c/busses/i2c-qcom-cci.c
> +++ b/drivers/i2c/busses/i2c-qcom-cci.c
> @@ -558,7 +558,7 @@ static int cci_probe(struct platform_device *pdev)
>                 cci->master[idx].adap.quirks = &cci->data->quirks;
>                 cci->master[idx].adap.algo = &cci_algo;
>                 cci->master[idx].adap.dev.parent = dev;
> -               cci->master[idx].adap.dev.of_node = child;
> +               cci->master[idx].adap.dev.of_node = of_node_get(child);
>                 cci->master[idx].master = idx;
>                 cci->master[idx].cci = cci;
>
> @@ -643,8 +643,10 @@ static int cci_probe(struct platform_device *pdev)
>                         continue;
>
>                 ret = i2c_add_adapter(&cci->master[i].adap);
> -               if (ret < 0)
> +               if (ret < 0) {
> +                       of_node_put(cci->master[i].adap.dev.of_node);
>                         goto error_i2c;
> +               }
>         }
>
>         pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
> @@ -656,8 +658,10 @@ static int cci_probe(struct platform_device *pdev)
>
>  error_i2c:
>         for (--i ; i >= 0; i--) {
> -               if (cci->master[i].cci)
> +               if (cci->master[i].cci) {
>                         i2c_del_adapter(&cci->master[i].adap);
> +                       of_node_put(cci->master[i].adap.dev.of_node);
> +               }
>         }
>  error:
>         disable_irq(cci->irq);
> @@ -673,8 +677,10 @@ static int cci_remove(struct platform_device *pdev)
>         int i;
>
>         for (i = 0; i < cci->data->num_masters; i++) {
> -               if (cci->master[i].cci)
> +               if (cci->master[i].cci) {
>                         i2c_del_adapter(&cci->master[i].adap);
> +                       of_node_put(cci->master[i].adap.dev.of_node);
> +               }
>                 cci_halt(cci, i);
>         }
>
> --
> 2.33.0
>

Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>



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