Re: [PATCH] adfs: validate nzones in adfs_read_map()

[paeyz]

From: Bae Yeonju <iwasbaeyz@xxxxxxxxx>

Hi,

I tested moving the nzones validation to adfs_validate_bblk() on
6.12.36 with KASAN enabled.

With this change, a crafted image with nzones=0 is rejected during
validation:

  ADFS-fs (loop0): error: can't find an ADFS filesystem on dev loop0.

mount() returns -EINVAL, and no crash or KASAN report is observed.

So the issue can be prevented by validating nzones earlier in the
validation path.

Tested-by: Bae Yeonju <iwasbaeyz@xxxxxxxxx>