From 02472e28b9a45471c6d8729ff2c7422baa9be46a 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: b4d72c08b358 ("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 38e97bb..8b342a8 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; -- 2.7.4