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Commit b00b4bf9 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
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[NET_SCHED]: Fix filter double free



cbq and atm destroy their filters twice when destroying inner classes
during qdisc destruction.

Reported-and-tested-by: default avatarStrobl Anton <a.strobl@aws-it.at>

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c355f53
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+1 −0
Original line number Diff line number Diff line
@@ -599,6 +599,7 @@ static void atm_tc_destroy(struct Qdisc *sch)
	/* races ? */
	while ((flow = p->flows)) {
		tcf_destroy_chain(flow->filter_list);
		flow->filter_list = NULL;
		if (flow->ref > 1)
			printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
			    flow->ref);
+5 −3
Original line number Diff line number Diff line
@@ -1748,10 +1748,12 @@ cbq_destroy(struct Qdisc* sch)
	 * classes from root to leafs which means that filters can still
	 * be bound to classes which have been destroyed already. --TGR '04
	 */
	for (h = 0; h < 16; h++)
		for (cl = q->classes[h]; cl; cl = cl->next)
	for (h = 0; h < 16; h++) {
		for (cl = q->classes[h]; cl; cl = cl->next) {
			tcf_destroy_chain(cl->filter_list);

			cl->filter_list = NULL;
		}
	}
	for (h = 0; h < 16; h++) {
		struct cbq_class *next;