linux-kernel - Re: [PATCH 4/6] ext4: remove unneeded check in get_dx

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Message-ID: <Z2VoSwYw+sFTzMx0@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date: Fri, 20 Dec 2024 18:21:23 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: tytso@....edu, adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] ext4: remove unneeded check in get_dx_countlimit

On Thu, Dec 19, 2024 at 07:00:25PM +0800, Kemeng Shi wrote:
> The "offset" is always non-NULL, remove unneeded NULL check of "offset".
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>

Hi Kemeng,

I know the current callers don't pass NULL but I think we should still
keep the check around just in case, to avoid NULL dereferences in
future. I don't think there's any harm in keeping it

Regards,
ojaswin

> ---
>  fs/ext4/namei.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 33670cebdedc..07a1bb570deb 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -434,8 +434,7 @@ static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
>  	} else
>  		return NULL;
>  
> -	if (offset)
> -		*offset = count_offset;
> +	*offset = count_offset;
>  	return (struct dx_countlimit *)(((void *)dirent) + count_offset);
>  }
>  
> -- 
> 2.30.0
>