linux-ext4 - Re: [PATCH] libext2fs : Fix the return values for ino=0 in ext2fs_read_inode

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Date:	Tue, 15 Jul 2008 10:40:22 +0530
From:	"Manish Katiyar" <mkatiyar@...il.com>
To:	linux-ext4@...r.kernel.org, "Theodore Tso" <tytso@....edu>
Subject: Re: [PATCH] libext2fs : Fix the return values for ino=0 in ext2fs_read_inode_full() if inode cache has been flushed.

On Sat, Jul 12, 2008 at 7:27 PM, Manish Katiyar <mkatiyar@...il.com> wrote:
> Hi Ted,
>
> It looks like the right place to check for ino=0 in
> ext2fs_read_inode_full() is before creating the inode cache, otherwise
> since we set icache[i].ino = 0 in create_icache(), it will match the
> loop below and thus we return a wrong value. Below patch fixes it.
>
> ==========================================================================
>
> Signed-off-by: "Manish Katiyar" <mkatiyar@...il.com>
>
> ---
>  lib/ext2fs/inode.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/ext2fs/inode.c b/lib/ext2fs/inode.c
> index 8908423..a08cb40 100644
> --- a/lib/ext2fs/inode.c
> +++ b/lib/ext2fs/inode.c
> @@ -536,6 +536,8 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs,
> ext2_ino_t ino,
>                if (retval != EXT2_ET_CALLBACK_NOTHANDLED)
>                        return retval;
>        }
> +       if ((ino == 0) || (ino > fs->super->s_inodes_count))
> +               return EXT2_ET_BAD_INODE_NUM;
>        /* Create inode cache if not present */
>        if (!fs->icache) {
>                retval = create_icache(fs);
> @@ -552,8 +554,6 @@ errcode_t ext2fs_read_inode_full(ext2_filsys fs,
> ext2_ino_t ino,
>                        }
>                }
>        }
> -       if ((ino == 0) || (ino > fs->super->s_inodes_count))
> -               return EXT2_ET_BAD_INODE_NUM;
>        if (fs->flags & EXT2_FLAG_IMAGE_FILE) {
>                inodes_per_block = fs->blocksize / EXT2_INODE_SIZE(fs->super);
>                block_nr = fs->image_header->offset_inode / fs->blocksize;
> --
> 1.5.4.3
>
>
> =====================================================================
>

Any ack/nack on this ?


> Thanks -
> Manish
>
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