linux-kernel - Re: [PATCH] maple_tree: Use correct variable type in sizeof

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Date:   Mon, 10 Apr 2023 08:58:17 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Peng Zhang <zhangpeng.00@...edance.com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org,
        David Binderman <dcb314@...mail.com>
Subject: Re: [PATCH] maple_tree: Use correct variable type in sizeof

* Peng Zhang <zhangpeng.00@...edance.com> [230410 05:17]:
> The original code is:
> 	memset(pivs + tmp, 0, sizeof(unsigned long *) * (max_p - tmp));

Please don't quote the code for these changes.

> 
> The type of variable pointed to by pivs is unsigned long, but the type
> used in sizeof is a pointer type. Change it to unsigned long.
> 
> Suggested-by: David Binderman <dcb314@...mail.com>
> Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>

Cc stable, fixes line is probably needed here.

Reviewed-by: Liam R. Howlett <Liam.Howlett@...cle.com>


> ---
>  lib/maple_tree.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/maple_tree.c b/lib/maple_tree.c
> index 88c44f6d6cee..b06fc5f19b31 100644
> --- a/lib/maple_tree.c
> +++ b/lib/maple_tree.c
> @@ -3255,7 +3255,7 @@ static inline void mas_destroy_rebalance(struct ma_state *mas, unsigned char end
>  
>  		if (tmp < max_p)
>  			memset(pivs + tmp, 0,
> -			       sizeof(unsigned long *) * (max_p - tmp));
> +			       sizeof(unsigned long) * (max_p - tmp));
>  
>  		if (tmp < mt_slots[mt])
>  			memset(slots + tmp, 0, sizeof(void *) * (max_s - tmp));
> -- 
> 2.20.1
>