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net_sched: let qdisc_put() accept NULL pointer

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When tcf_block_get() fails in sfb_init(), q->qdisc is still a NULL
pointer which leads to a crash in sfb_destroy(). Similar for
sch_dsmark.

Instead of fixing each separately, Linus suggested to just accept
NULL pointer in qdisc_put(), which would make callers easier.

(For sch_dsmark, the bug probably exists long before commit
6529eaba33.)

Fixes: 6529eaba33 ("net: sched: introduce tcf block infractructure")
Reported-by: [email protected]
Suggested-by: Linus Torvalds <[email protected]>
Cc: Jamal Hadi Salim <[email protected]>
Cc: Jiri Pirko <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Cong Wang 2019-09-12 10:22:30 -07:00 • committed by David S. Miller
commit 6efb971ba8
1 changed files with 3 additions and 0 deletions
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3
net/sched/sch_generic.c
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@ -985,6 +985,9 @@ static void qdisc_destroy(struct Qdisc *qdisc)
void qdisc_put(struct Qdisc *qdisc)
{
if (!qdisc)
return;
if (qdisc->flags & TCQ_F_BUILTIN ||
!refcount_dec_and_test(&qdisc->refcnt))
return;