linux-ext4 - Re: [PATCH 1/2] ext2fs: Fix error checking in dx

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Date:   Mon, 30 Mar 2020 15:24:40 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     Jan Kara <jack@...e.cz>
Cc:     Ted Tso <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext2fs: Fix error checking in dx_link()

On Mon, Mar 30, 2020 at 11:09:31AM +0200, Jan Kara wrote:
> dx_lookup() uses errcode_t return values. As such anything non-zero is
> an error, not values less than zero. Fix the error checking to avoid
> crashes on corrupted filesystems.

Looks good, thanks.

Signed-off-by: Lukas Czerner <lczerner@...hat.com>

> 
> Signed-off-by: Jan Kara <jack@...e.cz>
> ---
>  lib/ext2fs/link.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/ext2fs/link.c b/lib/ext2fs/link.c
> index 6f523aee718c..7b5bb022117c 100644
> --- a/lib/ext2fs/link.c
> +++ b/lib/ext2fs/link.c
> @@ -571,7 +571,7 @@ static errcode_t dx_link(ext2_filsys fs, ext2_ino_t dir,
>  	dx_info.namelen = strlen(name);
>  again:
>  	retval = dx_lookup(fs, dir, diri, &dx_info);
> -	if (retval < 0)
> +	if (retval)
>  		goto free_buf;
>  
>  	retval = add_dirent_to_buf(fs,
> -- 
> 2.16.4
>