ubifs image extract failed

When parsing an ubifs image, binwalk uses ubireader_extract_files to extract. However it may fail sometimes, and the extracted directory contained nothing but empty directory.

$ binwalk -e 0.ubi

$ tree .
.
├── 0.ubi
└── _0.ubi.extracted
    ├── 0.ubi
    └── ubifs-root
        └── 122063392
            └── kernel    # empty

If using ubireader_extract_images manually, it will extract files successfully. Then run binwalk against the extracted file.

$ ubireader_extract_images ./0.ubi

$ tree .
.
├── 0.ubi
└── ubifs-root
    └── 0.ubi
        ├── img-122063392_vol-kernel.ubifs
        └── img-122063392_vol-ubi_rootfs.ubifs

The ubifs file is attached. 0.zip

[krsh]

Some notes:

• UBI + UBIFS: works with binwalk or ubireader_extract_files
• UBI + SquashFS: doesn’t work with binwalk and works well with ubireader_extract_images

Can someone confirm this analysis?

[krsh]

• this file only works with pull request or ubireader_extract_images: https://www.downloads.netgear.com/files/GDC/RAX43/RAX43_V1.0.2.82_2.0.50.zip
• this file only works without pull request or ubireader_extract_files: https://downloads.linksys.com/support/assets/firmware/FW_MR9600_2.0.6.206937_prod.img