Re: [PATCH v1] drivers/base/auxiliary: check return value of strrchr()

[Greg KH]

On Fri, Sep 02, 2022 at 11:25:31PM -0700, Li Zhong wrote:
> From: Li Zhong <floridsleeves@xxxxxxxxx>
> 
> The return value of strrchr() could be NULL, which will cause invalid
> offset in (int)(p - name). So we check it here.
> 
> Signed-off-by: Li Zhong <floridsleeves@xxxxxxxxx>
> ---
>  drivers/base/auxiliary.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/auxiliary.c b/drivers/base/auxiliary.c
> index 8c5e65930617..7ac23be47e1f 100644
> --- a/drivers/base/auxiliary.c
> +++ b/drivers/base/auxiliary.c
> @@ -191,7 +191,8 @@ static int auxiliary_uevent(struct device *dev,
> struct kobj_uevent_env *env)
> 
>   name = dev_name(dev);
>   p = strrchr(name, '.');
> -
> + if (!p)
> + return -EINVAL;
>   return add_uevent_var(env, "MODALIAS=%s%.*s", AUXILIARY_MODULE_PREFIX,
>         (int)(p - name), name);
>  }
> -- 
> 2.25.1

Hi,

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