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由 Patrick McHardy 提交于
When the first fw classifier is initialized, there is a small window between the ->init() and ->change() calls, during which the classifier is active but not entirely set up and tp->root is still NULL (->init() does nothing). When a packet is queued during this window a NULL pointer dereference occurs in fw_classify() when trying to dereference head->mask; Signed-off-by: NPatrick McHardy <kaber@trash.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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