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 rollback after an error exit from qeth_hardsetup_card(), we are at risk ofaccessing card->qdio.in_q before it was allocated byqeth_alloc_qdio_queues() via qeth_mpc_initialize().qeth_clear_working_pool_list() then dereferences NULL, and by writing toqueue->bufs[i].pool_entry scribbles all over the CPU's lowcore.Resulting in a crash when those lowcore areas are used next (eg. onthe next machine-check interrupt).Such a scenario would typically happen when the device is first setonline and its queues aren't allocated yet. An early IO error or certainmisconfigs (eg. mismatched transport mode, bad portno) then cause us toerror out from qeth_hardsetup_card() with card->qdio.in_q still beingNULL.Fix it by checking the pointer for NULL before accessing it.Note that we also have (rare) paths inside qeth_mpc_initialize() wherea configuration change can cause us to free the existing queues,expecting that subsequent code will allocate them again. If we thenerror out before that re-allocation happens, the same bug occurs.Root-caused-by: Heiko Carstens <hca@linux.ibm.com>
CWE-476 NULL Pointer Dereference