linux-ext4 - Re: [PATCH] ext4: cleanup in-core orphan list if ext4_truncate() failed to get a transaction handle

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Date:   Mon, 10 May 2021 12:21:42 +0200
From:   Jan Kara <jack@...e.cz>
To:     Zhang Yi <yi.zhang@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yukuai3@...wei.com
Subject: Re: [PATCH] ext4: cleanup in-core orphan list if ext4_truncate()
 failed to get a transaction handle

On Fri 07-05-21 15:19:04, Zhang Yi wrote:
> In ext4_orphan_cleanup(), if ext4_truncate() failed to get a transaction
> handle, it didn't remove the inode from the in-core orphan list, which
> may probably trigger below error dump in ext4_destroy_inode() during the
> final iput() and could lead to memory corruption on the later orphan
> list changes.
> 
>  EXT4-fs (sda): Inode 6291467 (00000000b8247c67): orphan list check failed!
>  00000000b8247c67: 0001f30a 00000004 00000000 00000023  ............#...
>  00000000e24cde71: 00000006 014082a3 00000000 00000000  ......@.........
>  0000000072c6a5ee: 00000000 00000000 00000000 00000000  ................
>  ...
> 
> This patch fix this by cleanup in-core orphan list manually if
> ext4_truncate() return error.
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Thanks! The patch looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza


> ---
>  fs/ext4/super.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 7dc94f3e18e6..12850d72e9a4 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -3101,8 +3101,15 @@ static void ext4_orphan_cleanup(struct super_block *sb,
>  			inode_lock(inode);
>  			truncate_inode_pages(inode->i_mapping, inode->i_size);
>  			ret = ext4_truncate(inode);
> -			if (ret)
> +			if (ret) {
> +				/*
> +				 * We need to clean up the in-core orphan list
> +				 * manually if ext4_truncate() failed to get a
> +				 * transaction handle.
> +				 */
> +				ext4_orphan_del(NULL, inode);
>  				ext4_std_error(inode->i_sb, ret);
> +			}
>  			inode_unlock(inode);
>  			nr_truncates++;
>  		} else {
> -- 
> 2.25.4
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR