linux-kernel - Re: [PATCH] jfs: Verify inode mode when loading from disk

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Message-ID: <dce0adb2-a592-44d8-b208-d939415b8d54@I-love.SAKURA.ne.jp>
Date: Fri, 29 Aug 2025 22:16:49 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Dave Kleikamp <shaggy@...nel.org>, jfs-discussion@...ts.sourceforge.net
Cc: LKML <linux-kernel@...r.kernel.org>,
        Christian Brauner <brauner@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] jfs: Verify inode mode when loading from disk

Any questions? Should I find someone who can take this patch?

On 2025/08/10 23:55, Tetsuo Handa wrote:
> The inode mode loaded from corrupted disk can be invalid. Do like what
> commit 0a9e74051313 ("isofs: Verify inode mode when loading from disk")
> does.
> 
> Reported-by: syzbot <syzbot+895c23f6917da440ed0d@...kaller.appspotmail.com>
> Closes: https://syzkaller.appspot.com/bug?extid=895c23f6917da440ed0d
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> ---
>  fs/jfs/inode.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
> index fcedeb514e14..21f3d029da7d 100644
> --- a/fs/jfs/inode.c
> +++ b/fs/jfs/inode.c
> @@ -59,9 +59,15 @@ struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
>  			 */
>  			inode->i_link[inode->i_size] = '\0';
>  		}
> -	} else {
> +	} else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
> +		   S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
>  		inode->i_op = &jfs_file_inode_operations;
>  		init_special_inode(inode, inode->i_mode, inode->i_rdev);
> +	} else {
> +		printk(KERN_DEBUG "JFS: Invalid file type 0%04o for inode %lu.\n",
> +		       inode->i_mode, inode->i_ino);
> +		iget_failed(inode);
> +		return ERR_PTR(-EIO);
>  	}
>  	unlock_new_inode(inode);
>  	return inode;