s390/mm: Add missing mm check to do_secure_storage_access()

Similar like the normal exception handler the secure storage access
exception handler needs to verify if mm is not NULL, which may happen
with kernel threads.

Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/all/20260717132345.539A11F00A3A@smtp.kernel.org/
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>> ---
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2026-07-20 10:58:28 +02:00 • committed by Vasily Gorbik
commit 7cf227b270