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s390/qeth: don't process empty bridge port events
[ Upstream commit02472e28b9
] 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:b4d72c08b3
("qeth: bridgeport support - basic control") Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Reviewed-by: Alexandra Winter <wintera@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -1559,6 +1559,10 @@ static void qeth_bridge_state_change(struct qeth_card *card,
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int extrasize;
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QETH_CARD_TEXT(card, 2, "brstchng");
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if (qports->num_entries == 0) {
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QETH_CARD_TEXT(card, 2, "BPempty");
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return;
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}
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if (qports->entry_length != sizeof(struct qeth_sbp_port_entry)) {
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QETH_CARD_TEXT_(card, 2, "BPsz%04x", qports->entry_length);
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return;
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