[PATCH 10/11] ima: Don't ignore errors from crypto_shash_update()

[Mimi Zohar]

On Thu, 2020-06-18 at 18:04 +0200, Roberto Sassu wrote:
> Errors returned by crypto_shash_update() are not checked in
> ima_calc_boot_aggregate_tfm() and thus can be overwritten at the next
> iteration of the loop. This patch adds a check after calling
> crypto_shash_update() and returns immediately if the result is not zero.
> 
> Cc: stable at vger.kernel.org
> Fixes: 3323eec921efd ("integrity: IMA as an integrity service provider")
> Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>

Verification of the boot_aggregate will fail, but yes this should be
fixed.  This patch  and the next should be moved up front to the
beginning of the patch set.

Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>

thanks,

Mimi