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| author | Cong Wang <xiyou.wangcong@gmail.com> | 2020-07-08 20:13:59 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-22 09:31:59 +0200 |
| commit | 1343c5394537d9a7c6faac028462fe4df6d8254d (patch) | |
| tree | b531ead2b3e912c49628c595a17eb671f1481599 /net/sched | |
| parent | 5c6e5496a71b9f23aff69aa588e400d38eb73eba (diff) | |
| download | linux-stable-1343c5394537d9a7c6faac028462fe4df6d8254d.tar.gz linux-stable-1343c5394537d9a7c6faac028462fe4df6d8254d.tar.bz2 linux-stable-1343c5394537d9a7c6faac028462fe4df6d8254d.zip | |
net_sched: fix a memory leak in atm_tc_init()
[ Upstream commit 306381aec7c2b5a658eebca008c8a1b666536cba ]
When tcf_block_get() fails inside atm_tc_init(),
atm_tc_put() is called to release the qdisc p->link.q.
But the flow->ref prevents it to do so, as the flow->ref
is still zero.
Fix this by moving the p->link.ref initialization before
tcf_block_get().
Fixes: 6529eaba33f0 ("net: sched: introduce tcf block infractructure")
Reported-and-tested-by: syzbot+d411cff6ab29cc2c311b@syzkaller.appspotmail.com
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sched')
| -rw-r--r-- | net/sched/sch_atm.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c index cd49afca9617..91bd5c839303 100644 --- a/net/sched/sch_atm.c +++ b/net/sched/sch_atm.c @@ -551,16 +551,16 @@ static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt, if (!p->link.q) p->link.q = &noop_qdisc; pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); + p->link.vcc = NULL; + p->link.sock = NULL; + p->link.common.classid = sch->handle; + p->link.ref = 1; err = tcf_block_get(&p->link.block, &p->link.filter_list, sch, extack); if (err) return err; - p->link.vcc = NULL; - p->link.sock = NULL; - p->link.common.classid = sch->handle; - p->link.ref = 1; tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch); return 0; } |