================================================================== BUG: KASAN: use-after-free in __queue_work+0x28/0x4a0 kernel/workqueue.c:1425 Read at addr f9ff000026a3eb00 by task syz-fuzzer/2255 Pointer tag: [f9], memory tag: [fe] CPU: 0 PID: 2255 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008-ge01d50cbd6ee #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156 dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline] show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x1a8/0x4a0 mm/kasan/report.c:395 kasan_report+0x94/0xb4 mm/kasan/report.c:495 __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320 do_bad_area arch/arm64/mm/fault.c:473 [inline] do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 __queue_work+0x28/0x4a0 kernel/workqueue.c:1425 queue_work_on+0x6c/0x90 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] nci_cmd_timer+0x28/0x34 net/nfc/nci/core.c:615 call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474 expire_timers+0x98/0xc4 kernel/time/timer.c:1519 __run_timers kernel/time/timer.c:1790 [inline] __run_timers kernel/time/timer.c:1763 [inline] run_timer_softirq+0xf4/0x254 kernel/time/timer.c:1803 _stext+0x124/0x2a4 ____do_softirq+0x10/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x2c/0x5c 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+0xcc/0xf4 kernel/softirq.c:650 irq_exit_rcu+0x10/0x20 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x6c arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x2c arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577 generic_update_time fs/inode.c:1859 [inline] inode_update_time fs/inode.c:1872 [inline] touch_atime+0x26c/0x274 fs/inode.c:1944 file_accessed include/linux/fs.h:2521 [inline] pipe_read+0x384/0x460 fs/pipe.c:395 call_read_iter include/linux/fs.h:2185 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x274/0x2a0 fs/read_write.c:470 ksys_read+0xdc/0xf4 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x1c/0x2c fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142 do_el0_svc+0x2c/0xd0 arch/arm64/kernel/syscall.c:206 el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0xb8/0xc0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581 Allocated by task 6761: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 save_stack_info+0x38/0x130 mm/kasan/tags.c:104 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:138 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0x74/0xc4 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] kzalloc include/linux/slab.h:689 [inline] alloc_workqueue+0x2f0/0x4d0 kernel/workqueue.c:4314 nci_register_device+0x94/0x25c net/nfc/nci/core.c:1224 virtual_ncidev_open+0x60/0xe0 drivers/nfc/virtual_ncidev.c:146 misc_open+0x124/0x170 drivers/char/misc.c:143 chrdev_open+0xc0/0x260 fs/char_dev.c:414 do_dentry_open+0x13c/0x4d0 fs/open.c:882 vfs_open+0x2c/0x40 fs/open.c:1013 do_open fs/namei.c:3557 [inline] path_openat+0x568/0xee0 fs/namei.c:3713 do_filp_open+0x80/0x130 fs/namei.c:3740 do_sys_openat2+0xb4/0x16c 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+0x64/0xb0 fs/open.c:1337 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142 do_el0_svc+0x2c/0xd0 arch/arm64/kernel/syscall.c:206 el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0xb8/0xc0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581 Freed by task 0: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 save_stack_info+0x38/0x130 mm/kasan/tags.c:104 kasan_save_free_info+0x18/0x30 mm/kasan/tags.c:143 ____kasan_slab_free.constprop.0+0x1b8/0x230 mm/kasan/common.c:236 __kasan_slab_free+0x10/0x1c 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+0xbc/0x1fc mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x16c/0x2ec mm/slub.c:3674 kfree+0x60/0xb0 mm/slab_common.c:1007 rcu_free_wq+0x30/0x60 kernel/workqueue.c:3531 rcu_do_batch kernel/rcu/tree.c:2250 [inline] rcu_core+0x220/0x5d0 kernel/rcu/tree.c:2510 rcu_core_si+0x10/0x20 kernel/rcu/tree.c:2527 _stext+0x124/0x2a4 The buggy address belongs to the object at ffff000026a3ea00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 256 bytes inside of 512-byte region [ffff000026a3ea00, ffff000026a3ec00) The buggy address belongs to the physical page: page:00000000c4e03b6b refcount:1 mapcount:0 mapping:0000000000000000 index:0xf8ff000026a3e000 pfn:0x66a3e head:00000000c4e03b6b order:1 compound_mapcount:0 compound_pincount:0 flags: 0x1ffc00000010200(slab|head|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0) raw: 01ffc00000010200 fffffc00009a2d80 dead000000000004 f1ff000002c01400 raw: f8ff000026a3e000 0000000080100009 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff000026a3e900: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd ffff000026a3ea00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe >ffff000026a3eb00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ^ ffff000026a3ec00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ffff000026a3ed00: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 2255 at kernel/workqueue.c:1438 current_wq_worker kernel/workqueue_internal.h:68 [inline] WARNING: CPU: 0 PID: 2255 at kernel/workqueue.c:1438 is_chained_work kernel/workqueue.c:1377 [inline] WARNING: CPU: 0 PID: 2255 at kernel/workqueue.c:1438 __queue_work+0x3b8/0x4a0 kernel/workqueue.c:1438 Modules linked in: CPU: 0 PID: 2255 Comm: syz-fuzzer Tainted: G B 6.1.0-rc5-syzkaller-00008-ge01d50cbd6ee #0 Hardware name: linux,dummy-virt (DT) pstate: 604000c9 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __queue_work+0x3b8/0x4a0 kernel/workqueue.c:1438 lr : queue_work_on+0x6c/0x90 kernel/workqueue.c:1545 sp : ffff800008003dd0 x29: ffff800008003dd0 x28: 0000000000000005 x27: 0000000000000008 x26: fdff0000047a9f80 x25: ffff80000a2b60c0 x24: ffff80000a2b60c8 x23: dead000000000122 x22: ffff8000097abd90 x21: 0000000000000008 x20: f9ff000026a3ea00 x19: fbff000026af80a8 x18: 0000000000000000 x17: ffff800075918000 x16: ffff800008004000 x15: 00003486a52748a5 x14: 0000000000000302 x13: 0000000000000042 x12: fbff000026a8fc00 x11: fbff000026a8fc00 x10: 00000000004e1501 x9 : fbff000026a8fc42 x8 : 0000000000000800 x7 : 000000000000b873 x6 : 0000000000000000 x5 : f4ff000005606e78 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000100 x1 : 0000000000000100 x0 : fdff0000047a9f80 Call trace: current_wq_worker kernel/workqueue_internal.h:68 [inline] is_chained_work kernel/workqueue.c:1377 [inline] __queue_work+0x3b8/0x4a0 kernel/workqueue.c:1438 queue_work_on+0x6c/0x90 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] nci_cmd_timer+0x28/0x34 net/nfc/nci/core.c:615 call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474 expire_timers+0x98/0xc4 kernel/time/timer.c:1519 __run_timers kernel/time/timer.c:1790 [inline] __run_timers kernel/time/timer.c:1763 [inline] run_timer_softirq+0xf4/0x254 kernel/time/timer.c:1803 _stext+0x124/0x2a4 ____do_softirq+0x10/0x20 arch/arm64/kernel/irq.c:79 call_on_irq_stack+0x2c/0x5c 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+0xcc/0xf4 kernel/softirq.c:650 irq_exit_rcu+0x10/0x20 kernel/softirq.c:662 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x6c arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x2c arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:577 generic_update_time fs/inode.c:1859 [inline] inode_update_time fs/inode.c:1872 [inline] touch_atime+0x26c/0x274 fs/inode.c:1944 file_accessed include/linux/fs.h:2521 [inline] pipe_read+0x384/0x460 fs/pipe.c:395 call_read_iter include/linux/fs.h:2185 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x274/0x2a0 fs/read_write.c:470 ksys_read+0xdc/0xf4 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x1c/0x2c fs/read_write.c:621 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142 do_el0_svc+0x2c/0xd0 arch/arm64/kernel/syscall.c:206 el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0xb8/0xc0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:581 ---[ end trace 0000000000000000 ]---