From 6e326e4a34c645ed9c7e4b06818995ec4ea295ca Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Thu, 30 Jul 2020 17:01:20 +0200 Subject: [PATCH] s390/qeth: don't process empty bridge port events Discard events that don't contain any entries. This shouldn't happen, but subsequent code relies on being able to use entry 0. So better be safe than accessing garbage. Fixes: 415d00be3e08 ("qeth: bridgeport support - basic control") Signed-off-by: Julian Wiedmann Reviewed-by: Alexandra Winter Signed-off-by: David S. Miller --- drivers/s390/net/qeth_l2_main.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index 38e97bbde9edc..8b342a88ff5cb 100644 --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -1140,6 +1140,10 @@ static void qeth_bridge_state_change(struct qeth_card *card, int extrasize; QETH_CARD_TEXT(card, 2, "brstchng"); + if (qports->num_entries == 0) { + QETH_CARD_TEXT(card, 2, "BPempty"); + return; + } if (qports->entry_length != sizeof(struct qeth_sbp_port_entry)) { QETH_CARD_TEXT_(card, 2, "BPsz%04x", qports->entry_length); return; -- 2.39.5