linux-ext4 - Re: [PATCH] ext2: return error when fail to allocating memory in ioctl

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Date:   Thu, 24 Oct 2019 09:24:56 +0200
From:   Jan Kara <jack@...e.cz>
To:     Chengguang Xu <cgxu519@...ernel.net>
Cc:     jack@...e.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext2: return error when fail to allocating memory in
 ioctl

On Wed 23-10-19 21:56:43, Chengguang Xu wrote:
> Currently, we do not check memory allocation
> result for ei->i_block_alloc_info in ioctl,
> this patch checks it and returns error in
> failure case.
> 
> Signed-off-by: Chengguang Xu <cgxu519@...ernel.net>

Makes sense. Applied. Thanks!

							Honza

> ---
>  fs/ext2/ioctl.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext2/ioctl.c b/fs/ext2/ioctl.c
> index 1b853fb0b163..32a8d10b579d 100644
> --- a/fs/ext2/ioctl.c
> +++ b/fs/ext2/ioctl.c
> @@ -145,10 +145,13 @@ long ext2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		if (ei->i_block_alloc_info){
>  			struct ext2_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
>  			rsv->rsv_goal_size = rsv_window_size;
> +		} else {
> +			ret = -ENOMEM;
>  		}
> +
>  		mutex_unlock(&ei->truncate_mutex);
>  		mnt_drop_write_file(filp);
> -		return 0;
> +		return ret;
>  	}
>  	default:
>  		return -ENOTTY;
> -- 
> 2.21.0
> 
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR