From a46174487be7e14e5c19233a721ff0207733ab26 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Tue, 21 Sep 2021 16:52:15 +0200 Subject: [PATCH] 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. Fixes: c4463a45afb7 ("s390/qeth: tolerate pre-filled RX buffer") Reported-by: Stefan Raspl Root-caused-by: Heiko Carstens Signed-off-by: Julian Wiedmann Reviewed-by: Alexandra Winter Signed-off-by: Jakub Kicinski --- drivers/s390/net/qeth_core_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 41ca6273b7505..3fba440a0731a 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -202,6 +202,9 @@ static void qeth_clear_working_pool_list(struct qeth_card *card) &card->qdio.in_buf_pool.entry_list, list) list_del(&pool_entry->list); + if (!queue) + return; + for (i = 0; i < ARRAY_SIZE(queue->bufs); i++) queue->bufs[i].pool_entry = NULL; } -- 2.39.5