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Eric Dumazet a56d447f19 net/sched: sch_taprio: properly cancel timer from taprio_destroy() 
There is a comment in qdisc_create() about us not calling ops->reset()
in some cases.

err_out4:
	/*
	 * Any broken qdiscs that would require a ops->reset() here?
	 * The qdisc was never in action so it shouldn't be necessary.
	 */

As taprio sets a timer before actually receiving a packet, we need
to cancel it from ops->destroy, just in case ops->reset has not
been called.

syzbot reported:

ODEBUG: free active (active state 0) object type: hrtimer hint: advance_sched+0x0/0x9a0 arch/x86/include/asm/atomic64_64.h:22
WARNING: CPU: 0 PID: 8441 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505
Modules linked in:
CPU: 0 PID: 8441 Comm: syz-executor813 Not tainted 5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505
Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd e0 d3 e3 89 4c 89 ee 48 c7 c7 e0 c7 e3 89 e8 5b 86 11 05 <0f> 0b 83 05 85 03 92 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffc9000130f330 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffff88802baeb880 RSI: ffffffff815d87b5 RDI: fffff52000261e58
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815d25ee R11: 0000000000000000 R12: ffffffff898dd020
R13: ffffffff89e3ce20 R14: ffffffff81653630 R15: dffffc0000000000
FS:  0000000000f0d300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb64b3e000 CR3: 0000000036557000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __debug_check_no_obj_freed lib/debugobjects.c:987 [inline]
 debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018
 slab_free_hook mm/slub.c:1603 [inline]
 slab_free_freelist_hook+0x171/0x240 mm/slub.c:1653
 slab_free mm/slub.c:3213 [inline]
 kfree+0xe4/0x540 mm/slub.c:4267
 qdisc_create+0xbcf/0x1320 net/sched/sch_api.c:1299
 tc_modify_qdisc+0x4c8/0x1a60 net/sched/sch_api.c:1663
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2457
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

Fixes: 44d4775ca518 ("net/sched: sch_taprio: reset child qdiscs before freeing them")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Davide Caratti <dcaratti@redhat.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Acked-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-10-05 12:45:27 +01:00
..
act_api.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_bpf.c
bpf: Refactor BPF_PROG_RUN into a function
2021-08-17 00:45:07 +02:00
act_connmark.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_csum.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_ct.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_ctinfo.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_gact.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_gate.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_ife.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_ipt.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_meta_mark.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
act_meta_skbprio.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
act_meta_skbtcindex.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
act_mirred.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-08-13 06:41:22 -07:00
act_mpls.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_nat.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_pedit.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_police.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_sample.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_simple.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_skbedit.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_skbmod.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_tunnel_key.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
act_vlan.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_api.c
net: Fix offloading indirect devices dependency on qdisc order creation
2021-08-19 13:19:30 +01:00
cls_basic.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_bpf.c
bpf: Refactor BPF_PROG_RUN into a function
2021-08-17 00:45:07 +02:00
cls_cgroup.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_flow.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_flower.c
net: sched: flower: protect fl_walk() with rcu
2021-09-30 13:20:31 +01:00
cls_fw.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_matchall.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_route.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_rsvp6.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cls_rsvp.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
cls_rsvp.h
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_tcindex.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
cls_u32.c
net_sched: refactor TC action init API
2021-08-02 10:24:38 +01:00
em_canid.c
net: sched: kerneldoc fixes
2020-07-13 17:20:40 -07:00
em_cmp.c
net: sched: fix misspellings using misspell-fixer tool
2020-11-10 17:00:28 -08:00
em_ipset.c
sched: consistently handle layer3 header accesses in the presence of VLANs
2020-07-03 14:34:53 -07:00
em_ipt.c
sched: consistently handle layer3 header accesses in the presence of VLANs
2020-07-03 14:34:53 -07:00
em_meta.c
sched: consistently handle layer3 header accesses in the presence of VLANs
2020-07-03 14:34:53 -07:00
em_nbyte.c
net: sched: Return the correct errno code
2021-02-06 11:15:28 -08:00
em_text.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
em_u32.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ematch.c
net: sched: Fix spelling mistakes
2021-05-31 22:44:56 -07:00
Kconfig
net: sched: incorrect Kconfig dependencies on Netfilter modules
2020-12-09 15:49:29 -08:00
Makefile
net/sched: sch_frag: add generic packet fragment support.
2020-11-27 14:36:02 -08:00
sch_api.c
net: prevent user from passing illegal stab size
2021-09-26 11:09:07 +01:00
sch_atm.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_blackhole.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_cake.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-08-19 18:09:18 -07:00
sch_cbq.c
net: sched: Fix qdisc_rate_table refcount leak when get tcf_block failed
2021-08-30 20:29:03 -07:00
sch_cbs.c
net: don't include ethtool.h from netdevice.h
2020-11-23 17:27:04 -08:00
sch_choke.c
net: sched: validate stab values
2021-03-10 15:47:52 -08:00
sch_codel.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_drr.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_dsmark.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_etf.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_ets.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2021-08-26 17:57:57 -07:00
sch_fifo.c
net_sched: fix NULL deref in fifo_set_limit()
2021-10-01 14:59:10 -07:00
sch_fq_codel.c
fq_codel: reject silly quantum parameters
2021-09-04 10:49:46 +01:00
sch_fq_pie.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_fq.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_frag.c
net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets
2021-04-29 15:31:53 -07:00
sch_generic.c
net: sched: fix lockdep_set_class() typo error for sch->seqlock
2021-08-04 09:59:24 +01:00
sch_gred.c
net: sched: Fix spelling mistakes
2021-05-31 22:44:56 -07:00
sch_hfsc.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_hhf.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_htb.c
sch_htb: Fix inconsistency when leaf qdisc creation fails
2021-08-30 16:33:59 -07:00
sch_ingress.c
net: sched: Pass ingress block to tcf_classify_ingress
2020-02-19 17:49:48 -08:00
sch_mq.c
net: sched: fix dump qlen for sch_mq/sch_mqprio with NOLOCK subqueues
2019-12-03 11:53:55 -08:00
sch_mqprio.c
mqprio: Fix out-of-bounds access in mqprio_dump
2019-12-06 11:58:45 -08:00
sch_multiq.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_netem.c
netem: fix zero division in tabledist
2020-10-29 11:45:47 -07:00
sch_pie.c
net: sched: fix misspellings using misspell-fixer tool
2020-11-10 17:00:28 -08:00
sch_plug.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_prio.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_qfq.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_red.c
net: sched: validate stab values
2021-03-10 15:47:52 -08:00
sch_sfb.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_sfq.c
net/sched: store the last executed chain also for clsact egress
2021-07-29 22:17:37 +01:00
sch_skbprio.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_taprio.c
net/sched: sch_taprio: properly cancel timer from taprio_destroy()
2021-10-05 12:45:27 +01:00
sch_tbf.c
Revert "net: sched: Pass root lock to Qdisc_ops.enqueue"
2020-07-16 16:48:34 -07:00
sch_teql.c
net: sched: sch_teql: fix null-pointer dereference
2021-04-08 14:14:42 -07:00