================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline] BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline] BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline] BUG: KASAN: use-after-free in ax25_dev_put include/net/ax25.h:301 [inline] BUG: KASAN: use-after-free in ax25_dev_device_down+0x356/0x510 net/ax25/ax25_dev.c:122 Write of size 4 at addr ffff8880232157b8 by task syz.4.1047/12094 CPU: 0 PID: 12094 Comm: syz.4.1047 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27e/0x290 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:167 [inline] __refcount_sub_and_test include/linux/refcount.h:272 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] ax25_dev_put include/net/ax25.h:301 [inline] ax25_dev_device_down+0x356/0x510 net/ax25/ax25_dev.c:122 ax25_device_event+0x4d6/0x510 net/ax25/af_ax25.c:144 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] dev_close_many+0x32c/0x4b0 net/core/dev.c:1650 dev_close+0x1b3/0x2b0 net/core/dev.c:1672 bpq_device_event+0x3c8/0x9d0 drivers/net/hamradio/bpqether.c:548 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 __dev_notify_flags+0x1fd/0x3f0 net/core/dev.c:-1 dev_change_flags+0xe7/0x190 net/core/dev.c:8928 dev_ifsioc+0x147/0x1050 net/core/dev_ioctl.c:324 dev_ioctl+0x512/0xf00 net/core/dev_ioctl.c:587 sock_do_ioctl+0x27a/0x430 net/socket.c:1154 sock_ioctl+0x484/0x770 net/socket.c:1257 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f36f28fb169 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f36f0763038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f36f2b22fa0 RCX: 00007f36f28fb169 RDX: 0000200000000700 RSI: 0000000000008914 RDI: 000000000000000e RBP: 00007f36f297da68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f36f2b22fa0 R15: 00007ffd51670c18 Allocated by task 6345: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x143/0x290 mm/slub.c:3247 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] ax25_dev_device_up+0x51/0x5a0 net/ax25/ax25_dev.c:55 ax25_device_event+0x4a0/0x510 net/ax25/af_ax25.c:139 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 __dev_notify_flags+0x1fd/0x3f0 net/core/dev.c:-1 dev_change_flags+0xe7/0x190 net/core/dev.c:8928 dev_ifsioc+0x147/0x1050 net/core/dev_ioctl.c:324 dev_ioctl+0x512/0xf00 net/core/dev_ioctl.c:587 sock_do_ioctl+0x27a/0x430 net/socket.c:1154 sock_ioctl+0x484/0x770 net/socket.c:1257 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 12094: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xf1/0x270 mm/slub.c:4559 ax25_dev_put include/net/ax25.h:302 [inline] ax25_dev_device_down+0x1bd/0x510 net/ax25/ax25_dev.c:119 ax25_device_event+0x4d6/0x510 net/ax25/af_ax25.c:144 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] dev_close_many+0x32c/0x4b0 net/core/dev.c:1650 dev_close+0x1b3/0x2b0 net/core/dev.c:1672 bpq_device_event+0x3c8/0x9d0 drivers/net/hamradio/bpqether.c:548 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 __dev_notify_flags+0x1fd/0x3f0 net/core/dev.c:-1 dev_change_flags+0xe7/0x190 net/core/dev.c:8928 dev_ifsioc+0x147/0x1050 net/core/dev_ioctl.c:324 dev_ioctl+0x512/0xf00 net/core/dev_ioctl.c:587 sock_do_ioctl+0x27a/0x430 net/socket.c:1154 sock_ioctl+0x484/0x770 net/socket.c:1257 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1366 __queue_work+0x963/0xd00 kernel/workqueue.c:1532 queue_work_on+0x14b/0x250 kernel/workqueue.c:1559 inet6addr_event+0xf8/0x160 drivers/infiniband/core/roce_gid_mgmt.c:883 notifier_call_chain kernel/notifier.c:83 [inline] atomic_notifier_call_chain+0x15f/0x290 kernel/notifier.c:198 addrconf_ifdown+0xed2/0x1be0 net/ipv6/addrconf.c:3903 addrconf_notify+0x452/0xf40 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] dev_close_many+0x32c/0x4b0 net/core/dev.c:1650 unregister_netdevice_many+0x4b0/0x1840 net/core/dev.c:11109 default_device_exit_batch+0x390/0x3f0 net/core/dev.c:11666 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x886/0xc90 net/core/net_namespace.c:618 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1366 __queue_work+0x963/0xd00 kernel/workqueue.c:1532 queue_work_on+0x14b/0x250 kernel/workqueue.c:1559 queue_work include/linux/workqueue.h:512 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:659 [inline] netdevice_event+0x82f/0x960 drivers/infiniband/core/roce_gid_mgmt.c:802 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] unregister_netdevice_many+0xe98/0x1840 net/core/dev.c:11133 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:11066 unregister_netdevice include/linux/netdevice.h:3020 [inline] nsim_destroy+0x44/0x140 drivers/net/netdevsim/netdev.c:382 __nsim_dev_port_del+0x153/0x1b0 drivers/net/netdevsim/dev.c:1349 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1362 [inline] nsim_dev_reload_destroy+0x15e/0x240 drivers/net/netdevsim/dev.c:1561 nsim_dev_remove+0x59/0x100 drivers/net/netdevsim/dev.c:1577 __device_release_driver drivers/base/dd.c:1227 [inline] device_release_driver_internal+0x4cb/0x7f0 drivers/base/dd.c:1262 bus_remove_device+0x2e5/0x400 drivers/base/bus.c:531 device_del+0x6e2/0xbd0 drivers/base/core.c:3600 device_unregister+0x1c/0xc0 drivers/base/core.c:3633 nsim_bus_dev_del drivers/net/netdevsim/bus.c:454 [inline] del_device_store+0x321/0x470 drivers/net/netdevsim/bus.c:354 kernfs_fop_write_iter+0x3a2/0x4f0 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888023215700 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 184 bytes inside of 192-byte region [ffff888023215700, ffff8880232157c0) The buggy address belongs to the page: page:ffffea00008c8540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23215 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00006763c0 0000000400000004 ffff888017441a00 raw: 0000000000000000 0000000000100010 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 21, ts 8959847304, free_ts 8959512794 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5466 __alloc_pages_node include/linux/gfp.h:570 [inline] alloc_slab_page mm/slub.c:1777 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xb1/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] kmem_cache_alloc_node_trace+0x1ce/0x2e0 mm/slub.c:3270 kmalloc_node include/linux/slab.h:622 [inline] kzalloc_node include/linux/slab.h:746 [inline] alloc_worker kernel/workqueue.c:1861 [inline] create_worker+0x117/0x630 kernel/workqueue.c:1958 maybe_create_worker kernel/workqueue.c:2128 [inline] manage_workers kernel/workqueue.c:2180 [inline] worker_thread+0x4bf/0x1280 kernel/workqueue.c:2429 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 mm_free_pgd kernel/fork.c:653 [inline] __mmdrop+0xac/0x3e0 kernel/fork.c:704 free_bprm+0x135/0x2f0 fs/exec.c:1494 kernel_execve+0x3bd/0x9b0 fs/exec.c:2015 call_usermodehelper_exec_async+0x22f/0x370 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888023215680: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888023215700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888023215780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888023215800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888023215880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================