================================================================== BUG: KASAN: use-after-free in dump_schedule+0x68e/0x6f0 net/sched/sch_taprio.c:1848 Read of size 8 at addr ffff88806f8143c0 by task syz-executor.2/22233 CPU: 1 PID: 22233 Comm: syz-executor.2 Not tainted 5.17.0-rc1-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+0x57/0x7d lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 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+0x68e/0x6f0 net/sched/sch_taprio.c:1848 taprio_dump+0x431/0xb70 net/sched/sch_taprio.c:1917 tc_fill_qdisc+0x570/0xf60 net/sched/sch_api.c:924 qdisc_notify.isra.0+0x22b/0x2a0 net/sched/sch_api.c:990 tc_modify_qdisc+0xc4a/0x1630 net/sched/sch_api.c:1633 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5592 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x430/0x700 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x770/0xc10 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3091 kernel_sendpage.part.0+0x121/0x250 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xc7/0x1a0 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9ef/0x1b30 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 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: 0033:0x7f2a74b53a39 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:00007f2a742c9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f2a74c56f60 RCX: 00007f2a74b53a39 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f2a74bade8f R08: 0000000000010976 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2a7518ab2f R14: 00007f2a742c9300 R15: 0000000000022000 Allocated by task 22213: 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+0x51b/0x3a80 net/sched/sch_taprio.c:1484 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xafa/0x1630 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5592 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x430/0x700 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x770/0xc10 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3091 kernel_sendpage.part.0+0x121/0x250 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xc7/0x1a0 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9ef/0x1b30 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 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+0x130/0x160 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:3509 [inline] kfree+0xcb/0x280 mm/slub.c:4562 rcu_do_batch kernel/rcu/tree.c:2527 [inline] rcu_core+0x7b8/0x1540 kernel/rcu/tree.c:2778 __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:3026 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3106 taprio_change+0x259a/0x3a80 net/sched/sch_taprio.c:1604 qdisc_change net/sched/sch_api.c:1329 [inline] tc_modify_qdisc+0xafa/0x1630 net/sched/sch_api.c:1631 rtnetlink_rcv_msg+0x31d/0x8d0 net/core/rtnetlink.c:5592 netlink_rcv_skb+0x118/0x370 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x430/0x700 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x770/0xc10 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:725 sock_no_sendpage+0xea/0x130 net/core/sock.c:3091 kernel_sendpage.part.0+0x121/0x250 net/socket.c:3492 kernel_sendpage net/socket.c:3489 [inline] sock_sendpage+0xc7/0x1a0 net/socket.c:1007 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9ef/0x1b30 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 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:3591 cfg80211_update_known_bss+0x785/0xa90 net/wireless/scan.c:1661 cfg80211_bss_update+0xd9/0x1e50 net/wireless/scan.c:1708 cfg80211_inform_single_bss_frame_data+0x629/0xce0 net/wireless/scan.c:2464 cfg80211_inform_bss_frame_data+0x94/0xaa0 net/wireless/scan.c:2497 ieee80211_bss_info_update+0x267/0x870 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+0x127f/0x2fc0 net/mac80211/ibss.c:1639 ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline] ieee80211_iface_work+0x731/0x980 net/mac80211/iface.c:1581 process_one_work+0x879/0x1410 kernel/workqueue.c:2307 worker_thread+0x5a0/0xf60 kernel/workqueue.c:2454 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88806f814380 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff88806f814380, ffff88806f8143e0) The buggy address belongs to the page: page:ffffea0001be0500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f814 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001be0200 dead000000000004 ffff88800fc41780 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 3960, ts 58912083742, free_ts 58876521423 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa6f/0x2f10 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28a/0x3b0 mm/slub.c:2004 ___slab_alloc+0x87e/0xe80 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3255 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+0x141/0xa50 drivers/net/netdevsim/fib.c:1028 notifier_call_chain+0x94/0x170 kernel/notifier.c:84 atomic_notifier_call_chain+0x54/0xf0 kernel/notifier.c:199 call_fib_notifiers+0xd5/0x1d0 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:402 [inline] fib6_add_rt2node net/ipv6/ip6_fib.c:1223 [inline] fib6_add+0xae9/0x3590 net/ipv6/ip6_fib.c:1477 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_ins_rt+0xa9/0x100 net/ipv6/route.c:1312 __ipv6_ifa_notify+0x713/0x910 net/ipv6/addrconf.c:6114 ipv6_ifa_notify net/ipv6/addrconf.c:6153 [inline] addrconf_dad_completed+0x11b/0xcb0 net/ipv6/addrconf.c:4178 addrconf_dad_work+0x645/0x11a0 net/ipv6/addrconf.c:4126 process_one_work+0x879/0x1410 kernel/workqueue.c:2307 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page_list+0x1a9/0xfa0 mm/page_alloc.c:3441 release_pages+0x223/0xee0 mm/swap.c:980 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:243 [inline] tlb_flush_mmu mm/mmu_gather.c:250 [inline] tlb_finish_mmu+0x127/0x790 mm/mmu_gather.c:341 exit_mmap+0x1d1/0x580 mm/mmap.c:3180 __mmput+0xed/0x430 kernel/fork.c:1114 exit_mm kernel/exit.c:507 [inline] do_exit+0x909/0x2500 kernel/exit.c:793 do_group_exit+0xb2/0x2a0 kernel/exit.c:935 __do_sys_exit_group kernel/exit.c:946 [inline] __se_sys_exit_group kernel/exit.c:944 [inline] __x64_sys_exit_group+0x35/0x40 kernel/exit.c:944 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 Memory state around the buggy address: ffff88806f814280: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88806f814300: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88806f814380: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88806f814400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88806f814480: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================