Commit 88c5c1d2 authored by Martin Devera's avatar Martin Devera Committed by David S. Miller

net/sched/sch_htb.c: Check that node is really leaf before modifying cl->un.leaf

parent 7d8f0e46
......@@ -15,9 +15,11 @@
* helped a lot to locate nasty class stall bug
* Andi Kleen, Jamal Hadi, Bert Hubert
* code review and helpful comments on shaping
* Tomasz Wrona, <tw@eter.tym.pl>
* created test case so that I was able to fix nasty bug
* and many others. thanks.
*
* $Id: sch_htb.c,v 1.13 2002/05/25 09:04:50 devik Exp $
* $Id: sch_htb.c,v 1.14 2002/09/28 12:55:22 devik Exp devik $
*/
#include <linux/config.h>
#include <linux/module.h>
......@@ -69,7 +71,7 @@
#define HTB_HYSTERESIS 1/* whether to use mode hysteresis for speedup */
#define HTB_QLOCK(S) spin_lock_bh(&(S)->dev->queue_lock)
#define HTB_QUNLOCK(S) spin_unlock_bh(&(S)->dev->queue_lock)
#define HTB_VER 0x30006 /* major must be matched with number suplied by TC as version */
#define HTB_VER 0x30007 /* major must be matched with number suplied by TC as version */
#if HTB_VER >> 16 != TC_HTB_PROTOVER
#error "Mismatched sch_htb.c and pkt_sch.h"
......@@ -1496,6 +1498,9 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
#endif
} else sch_tree_lock(sch);
/* it used to be a nasty bug here, we have to check that node
is really leaf before changing cl->un.leaf ! */
if (!cl->level) {
cl->un.leaf.quantum = rtab->rate.rate / q->rate2quantum;
if (!hopt->quantum && cl->un.leaf.quantum < 1000) {
printk(KERN_WARNING "HTB: quantum of class %X is small. Consider r2q change.", cl->classid);
......@@ -1509,6 +1514,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
cl->un.leaf.quantum = hopt->quantum;
if ((cl->un.leaf.prio = hopt->prio) >= TC_HTB_NUMPRIO)
cl->un.leaf.prio = TC_HTB_NUMPRIO - 1;
}
cl->buffer = hopt->buffer;
cl->cbuffer = hopt->cbuffer;
......
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