================================================================== BUG: KASAN: slab-use-after-free in advance_sched+0xa70/0xac0 net/sched/sch_taprio.c:942 Read of size 8 at addr ffff0000cd850510 by task kworker/u8:3/42 CPU: 0 PID: 42 Comm: kworker/u8:3 Not tainted 6.9.0-rc4-syzkaller-00050-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: bat_events batadv_nc_worker Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 advance_sched+0xa70/0xac0 net/sched/sch_taprio.c:942 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x4a0/0xd08 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x2c0/0xb64 kernel/time/hrtimer.c:1818 timer_handler drivers/clocksource/arm_arch_timer.c:674 [inline] arch_timer_handler_virt+0x74/0x88 drivers/clocksource/arm_arch_timer.c:685 handle_percpu_devid_irq+0x174/0x308 kernel/irq/chip.c:942 generic_handle_irq_desc include/linux/irqdesc.h:161 [inline] handle_irq_desc kernel/irq/irqdesc.c:688 [inline] generic_handle_domain_irq+0x7c/0xc4 kernel/irq/irqdesc.c:744 __gic_handle_irq drivers/irqchip/irq-gic-v3.c:771 [inline] __gic_handle_irq_from_irqson drivers/irqchip/irq-gic-v3.c:822 [inline] gic_handle_irq+0x6c/0x190 drivers/irqchip/irq-gic-v3.c:866 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:889 do_interrupt_handler+0xd4/0x138 arch/arm64/kernel/entry-common.c:310 __el1_irq arch/arm64/kernel/entry-common.c:536 [inline] el1_interrupt+0x34/0x68 arch/arm64/kernel/entry-common.c:551 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:556 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:594 __lse__cmpxchg_case_acq_32 arch/arm64/include/asm/atomic_lse.h:271 [inline] __cmpxchg_case_acq_32 arch/arm64/include/asm/cmpxchg.h:120 [inline] __cmpxchg_acq arch/arm64/include/asm/cmpxchg.h:169 [inline] raw_atomic_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:2055 [inline] raw_atomic_try_cmpxchg_acquire include/linux/atomic/atomic-arch-fallback.h:2173 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1302 [inline] queued_spin_lock include/asm-generic/qspinlock.h:111 [inline] do_raw_spin_lock+0x14c/0x348 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] batadv_nc_purge_paths+0xd0/0x378 net/batman-adv/network-coding.c:442 batadv_nc_worker+0x314/0x580 net/batman-adv/network-coding.c:722 process_one_work+0x7b8/0x15d4 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:3416 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 26554: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x264/0x3f0 mm/slub.c:3997 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] taprio_change+0xd30/0x2c3c net/sched/sch_taprio.c:1862 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6613 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x7a0/0xa84 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 0: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object+0x124/0x18c mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x150/0x3e8 mm/slub.c:4390 taprio_free_sched_cb+0x158/0x178 net/sched/sch_taprio.c:201 rcu_do_batch kernel/rcu/tree.c:2196 [inline] rcu_core+0x888/0x1b3c kernel/rcu/tree.c:2471 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2488 __do_softirq+0x2e4/0xd2c kernel/softirq.c:554 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:541 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:551 __call_rcu_common kernel/rcu/tree.c:2734 [inline] call_rcu+0x104/0xb08 kernel/rcu/tree.c:2838 taprio_change+0x233c/0x2c3c net/sched/sch_taprio.c:1972 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x1474/0x1870 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x724/0xdbc net/core/rtnetlink.c:6595 netlink_rcv_skb+0x214/0x3c4 net/netlink/af_netlink.c:2559 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6613 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x7a0/0xa84 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000cd850400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 272 bytes inside of freed 512-byte region [ffff0000cd850400, ffff0000cd850600) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10d850 head: order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0x5ffe00000000840(slab|head|node=0|zone=2|lastcpupid=0xfff) page_type: 0xffffffff() raw: 05ffe00000000840 ffff0000c0001c80 fffffdffc35c4c00 dead000000000003 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 head: 05ffe00000000840 ffff0000c0001c80 fffffdffc35c4c00 dead000000000003 head: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 head: 05ffe00000000002 fffffdffc3361401 dead000000000122 00000000ffffffff head: 0000000400000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cd850400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cd850480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000cd850500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cd850580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cd850600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================