================================================================== BUG: KASAN: use-after-free in dump_schedule+0x79c/0x830 net/sched/sch_taprio.c:1848 Read of size 8 at addr ffff88801c8a9cc0 by task syz-executor.0/10786 CPU: 0 PID: 10786 Comm: syz-executor.0 Not tainted 5.16.0-rc4-next-20211210-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xa5/0x3ed mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 dump_schedule+0x79c/0x830 net/sched/sch_taprio.c:1848 taprio_dump+0x53d/0xdf0 net/sched/sch_taprio.c:1917 tc_fill_qdisc+0x5ff/0x11e0 net/sched/sch_api.c:924 qdisc_notify.isra.0+0x2b1/0x310 net/sched/sch_api.c:990 tc_modify_qdisc+0xf0c/0x1980 net/sched/sch_api.c:1633 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5570 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2492 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1341 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3086 kernel_sendpage.part.0+0x1ff/0x7b0 net/socket.c:3504 kernel_sendpage net/socket.c:3501 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1003 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0xb7e/0x1960 fs/splice.c:1079 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f22612aaa39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2260a20188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f22613adf60 RCX: 00007f22612aaa39 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f2261304e8f R08: 0000000000010976 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f22618e1b2f R14: 00007f2260a20300 R15: 0000000000022000 Allocated by task 10751: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] taprio_change+0x5fb/0x4060 net/sched/sch_taprio.c:1484 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xd87/0x1980 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5570 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2492 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1341 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3086 kernel_sendpage.part.0+0x1ff/0x7b0 net/socket.c:3504 kernel_sendpage net/socket.c:3501 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1003 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0xb7e/0x1960 fs/splice.c:1079 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 13: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd0/0x4b0 mm/slub.c:4561 rcu_do_batch kernel/rcu/tree.c:2530 [inline] rcu_core+0x7b8/0x1520 kernel/rcu/tree.c:2781 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3029 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3109 taprio_change+0x2efc/0x4060 net/sched/sch_taprio.c:1604 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xd87/0x1980 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5570 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2492 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1341 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3086 kernel_sendpage.part.0+0x1ff/0x7b0 net/socket.c:3504 kernel_sendpage net/socket.c:3501 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1003 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0xb7e/0x1960 fs/splice.c:1079 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3594 cfg80211_update_known_bss+0x833/0xa60 net/wireless/scan.c:1661 cfg80211_bss_update+0xef/0x2070 net/wireless/scan.c:1708 cfg80211_inform_single_bss_frame_data+0x6e8/0xee0 net/wireless/scan.c:2424 cfg80211_inform_bss_frame_data+0xa7/0xb50 net/wireless/scan.c:2457 ieee80211_bss_info_update+0x35b/0xb30 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline] ieee80211_ibss_rx_queued_mgmt+0x19cf/0x3130 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline] ieee80211_iface_work+0xa65/0xd00 net/mac80211/iface.c:1581 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454 kthread+0x405/0x4f0 kernel/kthread.c:345 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88801c8a9c80 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff88801c8a9c80, ffff88801c8a9ce0) The buggy address belongs to the page: page:ffffea0000722a40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c8a9 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888010c41780 raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 3649, ts 90961243689, free_ts 90929373643 prep_new_page mm/page_alloc.c:2433 [inline] get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4164 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5376 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28d/0x3a0 mm/slub.c:2004 ___slab_alloc+0x6be/0xd60 mm/slub.c:3019 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3106 slab_alloc_node mm/slub.c:3197 [inline] slab_alloc mm/slub.c:3239 [inline] kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3256 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:715 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:978 [inline] nsim_fib_event_nb+0x1b6/0xc50 drivers/net/netdevsim/fib.c:1028 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:198 call_fib_notifiers+0x119/0x2a0 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:401 [inline] fib6_add_rt2node net/ipv6/ip6_fib.c:1222 [inline] fib6_add+0xe21/0x3f10 net/ipv6/ip6_fib.c:1476 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_ins_rt+0xb2/0x110 net/ipv6/route.c:1312 __ipv6_ifa_notify+0x84e/0xa90 net/ipv6/addrconf.c:6114 ipv6_ifa_notify net/ipv6/addrconf.c:6153 [inline] addrconf_dad_completed+0x150/0xd60 net/ipv6/addrconf.c:4178 addrconf_dad_work+0x79f/0x1340 net/ipv6/addrconf.c:4126 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1351 [inline] free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1403 free_unref_page_prepare mm/page_alloc.c:3324 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3403 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0x100 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:766 [inline] slab_alloc_node mm/slub.c:3231 [inline] kmem_cache_alloc_node+0x255/0x3e0 mm/slub.c:3267 __alloc_skb+0x215/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1129 [inline] alloc_skb_with_frags+0x93/0x730 net/core/skbuff.c:5954 sock_alloc_send_pskb+0x793/0x920 net/core/sock.c:2581 mld_newpack+0x1df/0x770 net/ipv6/mcast.c:1754 add_grhead+0x265/0x330 net/ipv6/mcast.c:1857 add_grec+0x1053/0x14e0 net/ipv6/mcast.c:1995 mld_send_cr net/ipv6/mcast.c:2121 [inline] mld_ifc_work+0x452/0xdc0 net/ipv6/mcast.c:2659 process_one_work+0x9ac/0x1680 kernel/workqueue.c:2307 worker_thread+0x652/0x11c0 kernel/workqueue.c:2454 kthread+0x405/0x4f0 kernel/kthread.c:345 Memory state around the buggy address: ffff88801c8a9b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88801c8a9c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88801c8a9c80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88801c8a9d00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88801c8a9d80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================