================================================================== BUG: KASAN: use-after-free in __queue_work+0xfb8/0x12f0 kernel/workqueue.c:1437 Read of size 4 at addr ffff0000137179c0 by task swapper/1/0 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.1.0-rc4-syzkaller-00372-gaf7a05689189 #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0xe0/0x140 arch/arm64/kernel/stacktrace.c:156 show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x9c/0xd8 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x194/0x494 mm/kasan/report.c:395 kasan_report+0xa4/0x22c mm/kasan/report.c:495 __asan_report_load4_noabort+0x28/0x34 mm/kasan/report_generic.c:350 __queue_work+0xfb8/0x12f0 kernel/workqueue.c:1437 queue_work_on+0xc4/0x100 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] nci_cmd_timer+0x78/0xa0 net/nfc/nci/core.c:615 call_timer_fn+0x1f8/0xa90 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x69c/0xac0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xa4/0x1a0 kernel/time/timer.c:1803 _stext+0x28c/0x107c ____do_softirq+0x10/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x2c/0x54 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x1c/0x30 arch/arm64/kernel/irq.c:84 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x3bc/0x4dc kernel/softirq.c:650 irq_exit_rcu+0x14/0x80 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577 arch_local_irq_enable+0xc/0x20 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0x7c/0xf0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x3bc/0x530 kernel/sched/idle.c:303 cpu_startup_entry+0x28/0x30 kernel/sched/idle.c:400 secondary_start_kernel+0x1d4/0x220 arch/arm64/kernel/smp.c:265 __secondary_switched+0xb0/0xb4 arch/arm64/kernel/head.S:618 Allocated by task 4184: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x34 mm/kasan/generic.c:500 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0xa0/0xc0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0x74/0x110 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] kzalloc include/linux/slab.h:689 [inline] alloc_workqueue+0x6b8/0xad0 kernel/workqueue.c:4314 nci_register_device+0x1c0/0x8c0 net/nfc/nci/core.c:1224 virtual_ncidev_open+0x64/0xe0 drivers/nfc/virtual_ncidev.c:146 misc_open+0x294/0x394 drivers/char/misc.c:143 chrdev_open+0x1c0/0x54c fs/char_dev.c:414 do_dentry_open+0x3c4/0xf40 fs/open.c:882 vfs_open+0x90/0xd0 fs/open.c:1013 do_open fs/namei.c:3557 [inline] path_openat+0x1030/0x1fe0 fs/namei.c:3713 do_filp_open+0x154/0x330 fs/namei.c:3740 do_sys_openat2+0x124/0x390 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0x130/0x1c0 fs/open.c:1337 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x50/0x14c arch/arm64/kernel/syscall.c:206 el0_svc+0x54/0x140 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0xb8/0xc0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Freed by task 4201: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x124/0x1f0 mm/kasan/common.c:200 __kasan_slab_free+0x18/0x24 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x9c/0x1bc mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xa4/0x370 mm/slub.c:3674 kfree+0xdc/0x284 mm/slab_common.c:1007 rcu_free_wq+0x9c/0x10c kernel/workqueue.c:3531 rcu_do_batch kernel/rcu/tree.c:2250 [inline] rcu_core+0x874/0x1b50 kernel/rcu/tree.c:2510 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2527 _stext+0x28c/0x107c Last potentially related work creation: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb8/0xf0 mm/kasan/generic.c:481 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:491 call_rcu+0x9c/0x970 kernel/rcu/tree.c:2798 pwq_unbound_release_workfn+0x1c4/0x2a0 kernel/workqueue.c:3736 process_one_work+0x780/0x184c kernel/workqueue.c:2289 worker_thread+0x3cc/0xc40 kernel/workqueue.c:2436 kthread+0x23c/0x2a0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Second to last potentially related work creation: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb8/0xf0 mm/kasan/generic.c:481 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:491 kvfree_call_rcu+0x90/0x850 kernel/rcu/tree.c:3343 neigh_destroy+0x440/0x6dc net/core/neighbour.c:912 neigh_release include/net/neighbour.h:449 [inline] neigh_cleanup_and_release+0x158/0x4a0 net/core/neighbour.c:103 neigh_periodic_work+0x4f0/0x830 net/core/neighbour.c:994 process_one_work+0x780/0x184c kernel/workqueue.c:2289 worker_thread+0x3cc/0xc40 kernel/workqueue.c:2436 kthread+0x23c/0x2a0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 The buggy address belongs to the object at ffff000013717800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 448 bytes inside of 1024-byte region [ffff000013717800, ffff000013717c00) The buggy address belongs to the physical page: page:00000000c62b84cf refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x53710 head:00000000c62b84cf order:3 compound_mapcount:0 compound_pincount:0 flags: 0x1ffc00000010200(slab|head|node=0|zone=0|lastcpupid=0x7ff) raw: 01ffc00000010200 0000000000000000 dead000000000001 ffff000009002780 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000013717880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff000013717900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff000013717980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff000013717a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff000013717a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000000] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 6.1.0-rc4-syzkaller-00372-gaf7a05689189 #0 Hardware name: linux,dummy-virt (DT) pstate: a00000c5 (NzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __queue_work+0x1c0/0x12f0 kernel/workqueue.c:1459 lr : __queue_work+0x1bc/0x12f0 kernel/workqueue.c:1458 sp : ffff800010ab7b30 x29: ffff800010ab7b30 x28: 0000000000000001 x27: dfff800000000000 x26: ffff000009b420f8 x25: ffff80000de5cd50 x24: 0000000000000000 x23: 0000000000000000 x22: ffff80000de60610 x21: ffff80000de5cb68 x20: 0000000000000008 x19: ffff000013717800 x18: ffff00006a9eac00 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 205d314320202020 x12: ffff600001368420 x11: 1fffe0000136841f x10: ffff60000136841f x9 : dfff800000000000 x8 : ffff80000f2b5a20 x7 : ffff80000df02008 x6 : ffff000009029800 x5 : ffff000009400028 x4 : ffff000009400040 x3 : 1ffff00001be0401 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000009029800 Call trace: __queue_work+0x1c0/0x12f0 kernel/workqueue.c:1458 queue_work_on+0xc4/0x100 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] nci_cmd_timer+0x78/0xa0 net/nfc/nci/core.c:615 call_timer_fn+0x1f8/0xa90 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x69c/0xac0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xa4/0x1a0 kernel/time/timer.c:1803 _stext+0x28c/0x107c ____do_softirq+0x10/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x2c/0x54 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x1c/0x30 arch/arm64/kernel/irq.c:84 invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0x3bc/0x4dc kernel/softirq.c:650 irq_exit_rcu+0x14/0x80 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577 arch_local_irq_enable+0xc/0x20 arch/arm64/include/asm/irqflags.h:35 default_idle_call+0x7c/0xf0 kernel/sched/idle.c:109 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x3bc/0x530 kernel/sched/idle.c:303 cpu_startup_entry+0x28/0x30 kernel/sched/idle.c:400 secondary_start_kernel+0x1d4/0x220 arch/arm64/kernel/smp.c:265 __secondary_switched+0xb0/0xb4 arch/arm64/kernel/head.S:618 Code: d343fef8 aa1a03e0 97ffe27e aa0003e6 (38fb6b00) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d343fef8 lsr x24, x23, #3 4: aa1a03e0 mov x0, x26 8: 97ffe27e bl 0xffffffffffff8a00 c: aa0003e6 mov x6, x0 * 10: 38fb6b00 ldrsb w0, [x24, x27] <-- trapping instruction