linux-kernel - Re: [PATCH 7/7] ext4: set the type of max_zeroout to unsigned int to avoid overflow

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Message-ID: <5d4a3f94-453f-c3c3-390c-651d499b5c7b@huawei.com>
Date: Sat, 27 Jan 2024 10:12:01 +0800
From: Zhang Yi <yi.zhang@...wei.com>
To: Baokun Li <libaokun1@...wei.com>, <linux-ext4@...r.kernel.org>
CC: <tytso@....edu>, <adilger.kernel@...ger.ca>, <jack@...e.cz>,
	<ritesh.list@...il.com>, <linux-kernel@...r.kernel.org>,
	<yangerkun@...wei.com>, <chengzhihao1@...wei.com>, <yukuai3@...wei.com>
Subject: Re: [PATCH 7/7] ext4: set the type of max_zeroout to unsigned int to
 avoid overflow

On 2024/1/26 16:57, Baokun Li wrote:
> The max_zeroout is of type int and the s_extent_max_zeroout_kb is of
> type uint, and the s_extent_max_zeroout_kb can be freely modified via
> the sysfs interface. When the block size is 1024, max_zeroout may
> overflow, so declare it as unsigned int to avoid overflow.
> 
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

Looks good to me.

Reviewed-by: Zhang Yi <yi.zhang@...wei.com>

> ---
>  fs/ext4/extents.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 01299b55a567..8653b13e8248 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3425,10 +3425,8 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
>  	struct ext4_extent zero_ex1, zero_ex2;
>  	struct ext4_extent *ex, *abut_ex;
>  	ext4_lblk_t ee_block, eof_block;
> -	unsigned int ee_len, depth, map_len = map->m_len;
> -	int allocated = 0, max_zeroout = 0;
> -	int err = 0;
> -	int split_flag = EXT4_EXT_DATA_VALID2;
> +	unsigned int ee_len, depth, map_len = map->m_len, max_zeroout = 0;
> +	int err = 0, allocated = 0, split_flag = EXT4_EXT_DATA_VALID2;
>  
>  	ext_debug(inode, "logical block %llu, max_blocks %u\n",
>  		  (unsigned long long)map->m_lblk, map_len);
>