[PATCH v2] erofs: harden h_shared_count in erofs_init_inode_xattrs()

[Gao Xiang]

On 2026/3/17 23:24, Utkal Singh wrote:
> `u8 h_shared_count` indicates the shared xattr count of an inode. It is
> read from the on-disk xattr ibody header, which should be corrupted if
> the size of the shared xattr array exceeds the space available in
> `xattr_isize`.
> 
> It does not cause harmful consequence (e.g. crashes), since the image is
> already considered corrupted, it indeed results in the silent processing
> of garbage metadata.
> 
> Let's harden it to report -EFSCORRUPTED earlier.
> 
> Signed-off-by: Utkal Singh <singhutkal015 at gmail.com>

Reviewed-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Thanks,
Gao Xiang