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Subject[070/114] pkt_sched: Fix sch_sfq vs tc_modify_qdisc oops
2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jarek Poplawski <jarkao2@gmail.com>

[ Upstream commit 41065fba846e795b31b17e4dec01cb904d56c6cd ]

sch_sfq as a classful qdisc needs the .leaf handler. Otherwise, there
is an oops possible in tc_modify_qdisc()/check_loop().

Fixes commit 7d2681a6ff4f9ab5e48d02550b4c6338f1638998

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
net/sched/sch_sfq.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -497,6 +497,11 @@ nla_put_failure:
return -1;
}

+static struct Qdisc *sfq_leaf(struct Qdisc *sch, unsigned long arg)
+{
+ return NULL;
+}
+
static unsigned long sfq_get(struct Qdisc *sch, u32 classid)
{
return 0;
@@ -560,6 +565,7 @@ static void sfq_walk(struct Qdisc *sch,
}

static const struct Qdisc_class_ops sfq_class_ops = {
+ .leaf = sfq_leaf,
.get = sfq_get,
.tcf_chain = sfq_find_tcf,
.bind_tcf = sfq_bind,



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