Re: [PATCH v2] ext4: Minor fix for ext4_split_extent_zeroout()

[Baokun Li <libaokun@linux.alibaba.com>]

On 3/2/26 10:38 PM, Ojaswin Mujoo wrote:
> We missed storing the error which triggerd smatch warning:
>
> 	fs/ext4/extents.c:3369 ext4_split_extent_zeroout()
> 	warn: duplicate zero check 'err' (previous on line 3363)
>
> fs/ext4/extents.c
>     3361
>     3362         err = ext4_ext_get_access(handle, inode, path + depth);
>     3363         if (err)
>     3364                 return err;
>     3365
>     3366         ext4_ext_mark_initialized(ex);
>     3367
>     3368         ext4_ext_dirty(handle, inode, path + depth);
> --> 3369         if (err)
>     3370                 return err;
>     3371
>     3372         return 0;
>     3373 }
>
> Fix it by correctly storing the err value from ext4_ext_dirty().
>
> Link: https://lore.kernel.org/all/aYXvVgPnKltX79KE@stanley.mountain/
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Fixes: a985e07c26455 ("ext4: refactor zeroout path and handle all cases")
> Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
> Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Looks good to me.

Reviewed-by: Baokun Li <libaokun@linux.alibaba.com>
> ---
>  fs/ext4/extents.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 3630b27e4fd7..5579e0e68c0f 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3365,7 +3365,7 @@ static int ext4_split_extent_zeroout(handle_t *handle, struct inode *inode,
>  
>  	ext4_ext_mark_initialized(ex);
>  
> -	ext4_ext_dirty(handle, inode, path + depth);
> +	err = ext4_ext_dirty(handle, inode, path + depth);
>  	if (err)
>  		return err;
>