[PATCH 2/3] erofs: use LZ4_decompress_safe() for full decoding

[Chao Yu]

On 2020/2/26 10:30, Gao Xiang wrote:
> As Lasse pointed out, "EROFS uses LZ4_decompress_safe_partial
> for both partial and full blocks. Thus when it is decoding a
> full block, it doesn't know if the LZ4 decoder actually decoded
> all the input. The real uncompressed size could be bigger than
> the value stored in the file system metadata.
> 
> Using LZ4_decompress_safe instead of _safe_partial when
> decompressing a full block would help to detect errors."
> 
> So it's reasonable to use _safe in case of corrupted images and
> it might have some speed gain as well although I didn't observe
> much difference.
> 
> Cc: Lasse Collin <lasse.collin at tukaani.org>
> Signed-off-by: Gao Xiang <gaoxiang25 at huawei.com>

Reviewed-by: Chao Yu <yuchao0 at huawei.com>

Thanks,