linux-kernel - Re: [PATCH] ACPI: move from strlcpy with unused retval to strscpy

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Date:   Tue, 23 Aug 2022 18:58:07 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] ACPI: move from strlcpy with unused retval to strscpy

On Thu, Aug 18, 2022 at 11:00 PM Wolfram Sang
<wsa+renesas@...g-engineering.com> wrote:
>
> Follow the advice of the below link and prefer 'strscpy' in this
> subsystem. Conversion is 1:1 because the return value is not used.
> Generated by a coccinelle script.
>
> Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
>  drivers/acpi/bus.c            | 4 ++--
>  drivers/acpi/processor_idle.c | 8 ++++----
>  drivers/acpi/utils.c          | 6 +++---
>  3 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index c0d20d997891..1d29f5dc7d79 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -802,7 +802,7 @@ static bool acpi_of_modalias(struct acpi_device *adev,
>
>         str = obj->string.pointer;
>         chr = strchr(str, ',');
> -       strlcpy(modalias, chr ? chr + 1 : str, len);
> +       strscpy(modalias, chr ? chr + 1 : str, len);
>
>         return true;
>  }
> @@ -822,7 +822,7 @@ void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
>                        char *modalias, size_t len)
>  {
>         if (!acpi_of_modalias(adev, modalias, len))
> -               strlcpy(modalias, default_id, len);
> +               strscpy(modalias, default_id, len);
>  }
>  EXPORT_SYMBOL_GPL(acpi_set_modalias);
>
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index 16a1663d02d4..1778016ea895 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -787,7 +787,7 @@ static int acpi_processor_setup_cstates(struct acpi_processor *pr)
>
>                 state = &drv->states[count];
>                 snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
> -               strlcpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
> +               strscpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
>                 state->exit_latency = cx->latency;
>                 state->target_residency = cx->latency * latency_factor;
>                 state->enter = acpi_idle_enter;
> @@ -956,7 +956,7 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
>
>                 obj = pkg_elem + 9;
>                 if (obj->type == ACPI_TYPE_STRING)
> -                       strlcpy(lpi_state->desc, obj->string.pointer,
> +                       strscpy(lpi_state->desc, obj->string.pointer,
>                                 ACPI_CX_DESC_LEN);
>
>                 lpi_state->index = state_idx;
> @@ -1022,7 +1022,7 @@ static bool combine_lpi_states(struct acpi_lpi_state *local,
>         result->arch_flags = parent->arch_flags;
>         result->index = parent->index;
>
> -       strlcpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
> +       strscpy(result->desc, local->desc, ACPI_CX_DESC_LEN);
>         strlcat(result->desc, "+", ACPI_CX_DESC_LEN);
>         strlcat(result->desc, parent->desc, ACPI_CX_DESC_LEN);
>         return true;
> @@ -1196,7 +1196,7 @@ static int acpi_processor_setup_lpi_states(struct acpi_processor *pr)
>
>                 state = &drv->states[i];
>                 snprintf(state->name, CPUIDLE_NAME_LEN, "LPI-%d", i);
> -               strlcpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
> +               strscpy(state->desc, lpi->desc, CPUIDLE_DESC_LEN);
>                 state->exit_latency = lpi->wake_latency;
>                 state->target_residency = lpi->min_residency;
>                 if (lpi->arch_flags)
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 5a7b8065e77f..4acd6f7d1395 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -878,7 +878,7 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
>         struct acpi_dev_match_info match = {};
>         struct device *dev;
>
> -       strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
> +       strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
>         match.uid = uid;
>         match.hrv = hrv;
>
> @@ -911,7 +911,7 @@ acpi_dev_get_next_match_dev(struct acpi_device *adev, const char *hid, const cha
>         struct acpi_dev_match_info match = {};
>         struct device *dev;
>
> -       strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
> +       strscpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
>         match.uid = uid;
>         match.hrv = hrv;
>
> @@ -961,7 +961,7 @@ EXPORT_SYMBOL(acpi_video_backlight_string);
>
>  static int __init acpi_backlight(char *str)
>  {
> -       strlcpy(acpi_video_backlight_string, str,
> +       strscpy(acpi_video_backlight_string, str,
>                 sizeof(acpi_video_backlight_string));
>         return 1;
>  }
> --

Applied as 6.1 material, thanks!