linux-kernel - Re: [PATCH] raid1: fix error: ISO C90 forbids mixed declarations

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Date:   Mon, 11 Sep 2023 14:42:43 -0700
From:   Song Liu <song@...nel.org>
To:     Nigel Croxon <ncroxon@...hat.com>
Cc:     yukuai1@...weicloud.com, Zhang Shurong <zhang_shurong@...mail.com>,
        linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com
Subject: Re: [PATCH] raid1: fix error: ISO C90 forbids mixed declarations

On Sat, Sep 9, 2023 at 4:53 AM Nigel Croxon <ncroxon@...hat.com> wrote:
>
> There is a compile error when this commit is added:
> md: raid1: fix potential OOB in raid1_remove_disk()
>
> drivers/md/raid1.c: In function 'raid1_remove_disk':
> drivers/md/raid1.c:1844:9: error: ISO C90 forbids mixed declarations
> and code [-Werror=declaration-after-statement]
> 1844 |         struct raid1_info *p = conf->mirrors + number;
>       |         ^~~~~~
>
> That's because the new code was inserted before the struct.
> The change is move the struct command above this commit.
>
> Fixes: md: raid1: fix potential OOB in raid1_remove_disk()
> commit 8b0472b50bcf
>
> Signed-off-by: Nigel Croxon <ncroxon@...hat.com>

Applied to md-fixes after some minor fixes.

Thanks,
Song

> ---
>   drivers/md/raid1.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index a5453b126aab..4f1483bb708b 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -1846,11 +1846,11 @@ static int raid1_remove_disk(struct mddev
> *mddev, struct md_rdev *rdev)
>       int err = 0;
>       int number = rdev->raid_disk;
>
> +    struct raid1_info *p = conf->mirrors + number;
> +
>       if (unlikely(number >= conf->raid_disks))
>           goto abort;
>
> -    struct raid1_info *p = conf->mirrors + number;
> -
>       if (rdev != p->rdev)
>           p = conf->mirrors + conf->raid_disks + number;
>
> --
> 2.31.1
>