提交 343723dd 编写于 作者: J Jiri Pirko 提交者: David S. Miller

net: sched: fix clsact init error path

Since in qdisc_create, the destroy op is called when init fails, we
don't do cleanup in init and leave it up to destroy.
This fixes use-after-free when trying to put already freed block.

Fixes: 6e40cf2d ("net: sched: use extended variants of block_get/put in ingress and clsact qdiscs")
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Acked-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 c05fad57
......@@ -351,6 +351,8 @@ void tcf_block_put_ext(struct tcf_block *block, struct Qdisc *q,
{
struct tcf_chain *chain;
if (!block)
return;
/* Hold a refcnt for all chains, except 0, so that they don't disappear
* while we are iterating.
*/
......@@ -377,8 +379,6 @@ void tcf_block_put(struct tcf_block *block)
{
struct tcf_block_ext_info ei = {0, };
if (!block)
return;
tcf_block_put_ext(block, block->q, &ei);
}
......
......@@ -190,7 +190,7 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
err = tcf_block_get_ext(&q->egress_block, sch, &q->egress_block_info);
if (err)
goto err_egress_block_get;
return err;
net_inc_ingress_queue();
net_inc_egress_queue();
......@@ -198,10 +198,6 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt)
sch->flags |= TCQ_F_CPUSTATS;
return 0;
err_egress_block_get:
tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
return err;
}
static void clsact_destroy(struct Qdisc *sch)
......
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