Re: [PATCH] ASoC: wm8962: potential use of error pointer

[Charles Keepax]

On Fri, Dec 17, 2021 at 11:13:33AM +0800, Jiasheng Jiang wrote:
> The return value of devm_clk_get() needs to be checked.
> To avoid use of error pointer in case of the failure of alloc.
> 
> Fixes: d74e9e7090ae ("ASoC: wm8962: Add device tree binding")
> Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
> ---
>  sound/soc/codecs/wm8962.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/soc/codecs/wm8962.c b/sound/soc/codecs/wm8962.c
> index 34080f497584..66693bf17763 100644
> --- a/sound/soc/codecs/wm8962.c
> +++ b/sound/soc/codecs/wm8962.c
> @@ -3540,6 +3540,8 @@ static int wm8962_set_pdata_from_of(struct i2c_client *i2c,
>  		}
>  
>  	pdata->mclk = devm_clk_get(&i2c->dev, NULL);
> +	if (IS_ERR(pdata->mclk))
> +		return -ENOMEM;

The value was checked later, so the code was mostly fine and what
bugs there were have already been fixed:

044c11401443 ("ASoC: wm8962: Convert to devm_clk_get_optional")

Thanks,
Charles