CVE-2021-47369

In the Linux kernel, the following vulnerability has been resolved:
s390/qeth: fix NULL deref in qeth_clear_working_pool_list() When
qeth_set_online() calls qeth_clear_working_pool_list() to roll back after
an error exit from qeth_hardsetup_card(), we are at risk of accessing
card->qdio.in_q before it was allocated by qeth_alloc_qdio_queues() via
qeth_mpc_initialize(). qeth_clear_working_pool_list() then dereferences
NULL, and by writing to queue->bufs[i].pool_entry scribbles all over the
CPU’s lowcore. Resulting in a crash when those lowcore areas are used next
(eg. on the next machine-check interrupt). Such a scenario would typically
happen when the device is first set online and its queues aren’t allocated
yet. An early IO error or certain misconfigs (eg. mismatched transport
mode, bad portno) then cause us to error out from qeth_hardsetup_card()
with card->qdio.in_q still being NULL. Fix it by checking the pointer for
NULL before accessing it. Note that we also have (rare) paths inside
qeth_mpc_initialize() where a configuration change can cause us to free the
existing queues, expecting that subsequent code will allocate them again.
If we then error out before that re-allocation happens, the same bug
occurs. Root-caused-by: Heiko Carstens <[email protected]>