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Date:   Sat, 23 Dec 2017 11:14:07 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Yunlong Song <yunlong.song@...wei.com>, <jaegeuk@...nel.org>,
        <chao@...nel.org>, <yunlong.song@...oud.com>
CC:     <miaoxie@...wei.com>, <bintian.wang@...wei.com>,
        <shengyong1@...wei.com>, <heyunlei@...wei.com>,
        <linux-fsdevel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] fsck.f2fs: check nid range before use to avoid
 segmentation fault

On 2017/12/18 19:53, Yunlong Song wrote:
> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>

How about introducing IS_AVAILABLE_NID as below, and use it instead?

#define IS_AVAILABLE_NID(sbi, nid)	(IS_VALID_NID(sbi, nid) && (nid >= root_ino))

Thanks,

> ---
>  fsck/fsck.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fsck/fsck.c b/fsck/fsck.c
> index 11b8b0b..faf0663 100644
> --- a/fsck/fsck.c
> +++ b/fsck/fsck.c
> @@ -740,7 +740,7 @@ void fsck_chk_inode_blk(struct f2fs_sb_info *sbi, u32 nid,
>  	for (idx = 0; idx < 5; idx++) {
>  		u32 nid = le32_to_cpu(node_blk->i.i_nid[idx]);
>  
> -		if (nid != 0) {
> +		if (nid != 0 && IS_VALID_NID(sbi, nid)) {
>  			struct node_info ni;
>  
>  			get_node_info(sbi, nid, &ni);
> 

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