[PATCH] fs/squashfs: fix reading of fragmented files

[Miquel Raynal]

Hi Joao,

Joao Marcos Costa <jmcosta944 at gmail.com> wrote on Mon, 17 May 2021
18:20:38 -0300:

> The fragmented files were not correctly read because of two issues:
> 
> - The squashfs_file_info struct has a field named 'comp', which tells if
> the file's fragment is compressed or not. This field was always set to
> 'true' in sqfs_get_regfile_info and sqfs_get_lregfile_info. It should
> actually take sqfs_frag_lookup's return value. This patch addresses
> these two assignments.
> 
> - In sqfs_read, the fragments (compressed or not) were copied to the
> output buffer through a for loop which was reading data at the wrong
> offset. Replace these loops by equivalent calls to memcpy, with the
> right parameters.

Good idea to get rid of these memcpy of 1 byte :)

> I tested this patch by comparing the MD5 checksum of a few fragmented
> files with the respective md5sum output in sandbox, considering both
> compressed and uncompressed fragments.
> 
> Signed-off-by: Joao Marcos Costa <jmcosta944 at gmail.com>

Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>

But next time, when you fix two issues (even if they fix the same
feature) please provide two patches ;)

Thanks,
Miquèl