[PATCH] squashfs: Fix sqfsls errors when root is a ldir

[Miquel Raynal]

Hi Campbell,

campbell at snapit.group wrote on Wed, 15 Dec 2021 14:53:43 +1300:

> Previously, if root had more than 256 files or otherwise needed to be an
> ldir, sqfsls would emit the error 'Inode not found.' which was caused by
> code in sqfs_search_dir assuming it was a regular directory inode.
> 

It would be good to group your commits into series, generated
automatically with git-format-patch.

Also when you send different version of patches, you need to generate
them with a different version in the subject prefix with the option:
-v <version>

Otherwise for this commit:
Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>

> Signed-off-by: Campbell Suter <campbell at snapit.group>
> ---
> 
>   fs/squashfs/sqfs.c | 16 +++++++++++++---
>   1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
> index e2d91c654c..4d7bf76fa3 100644
> --- a/fs/squashfs/sqfs.c
> +++ b/fs/squashfs/sqfs.c
> @@ -482,13 +482,20 @@ static int sqfs_search_dir(struct squashfs_dir_stream *dirs, char **token_list,
>     	/* Initialize squashfs_dir_stream members */
>   	dirs->table += SQFS_DIR_HEADER_SIZE;
> -	dirs->size = get_unaligned_le16(&dir->file_size) - SQFS_DIR_HEADER_SIZE;
> +	if (le16_to_cpu(dirs->i_dir.inode_type) == SQFS_DIR_TYPE)
> +		dirs->size = get_unaligned_le16(&dir->file_size);
> +	else
> +		dirs->size = get_unaligned_le32(&ldir->file_size);
> +	dirs->size -= SQFS_DIR_HEADER_SIZE;
>   	dirs->entry_count = dirs->dir_header->count + 1;
>     	/* No path given -> root directory */
>   	if (!strcmp(token_list[0], "/")) {
>   		dirs->table = &dirs->dir_table[offset];
> -		memcpy(&dirs->i_dir, dir, sizeof(*dir));
> +		if (le16_to_cpu(dirs->i_dir.inode_type) == SQFS_DIR_TYPE)
> +			memcpy(&dirs->i_dir, dir, sizeof(*dir));
> +		else
> +			memcpy(&dirs->i_ldir, ldir, sizeof(*ldir));
>   		return 0;
>   	}
>   @@ -608,7 +615,10 @@ static int sqfs_search_dir(struct squashfs_dir_stream *dirs, char **token_list,
>   		}
>     		dirs->table += SQFS_DIR_HEADER_SIZE;
> -		dirs->size = get_unaligned_le16(&dir->file_size);
> +		if (le16_to_cpu(dirs->i_dir.inode_type) == SQFS_DIR_TYPE)
> +			dirs->size = get_unaligned_le16(&dir->file_size);
> +		else
> +			dirs->size = get_unaligned_le32(&ldir->file_size);
>   		dirs->entry_count = dirs->dir_header->count + 1;
>   		dirs->size -= SQFS_DIR_HEADER_SIZE;
>   		free(dirs->entry);


Thanks,
Miquèl