IPv6: ADDRCONF(NETDEV_CHANGE): bpq0: link becomes ready ================================================================== 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 ffff888023a965b8 by task syz.0.85/4546 CPU: 0 PID: 4546 Comm: syz.0.85 Not tainted 5.15.178-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 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+0x4d1/0x500 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_info net/core/dev.c:2018 [inline] call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] dev_close_many+0x37c/0x530 net/core/dev.c:1619 dev_close+0x1b3/0x2b0 net/core/dev.c:1641 bpq_device_event+0x3c3/0x9d0 drivers/net/hamradio/bpqether.c:548 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2018 [inline] call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] dev_close_many+0x37c/0x530 net/core/dev.c:1619 dev_close+0x1b3/0x2b0 net/core/dev.c:1641 bond_setup_by_slave+0x66/0x390 drivers/net/bonding/bond_main.c:1471 bond_enslave+0x7b1/0x3c20 drivers/net/bonding/bond_main.c:1855 bond_do_ioctl+0x2a1/0xb40 drivers/net/bonding/bond_main.c:4238 dev_ifsioc+0xd7a/0x10c0 net/core/dev_ioctl.c:417 dev_ioctl+0x504/0xf60 net/core/dev_ioctl.c:587 sock_do_ioctl+0x34f/0x5a0 net/socket.c:1154 sock_ioctl+0x47f/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/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f962fed7169 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:00007f962dd40038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f96300effa0 RCX: 00007f962fed7169 RDX: 0000400000000180 RSI: 0000000000008990 RDI: 000000000000000c RBP: 00007f962ff582a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f96300effa0 R15: 00007ffc45991598 Allocated by task 4546: 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:591 [inline] kzalloc include/linux/slab.h:721 [inline] ax25_dev_device_up+0x51/0x5a0 net/ax25/ax25_dev.c:55 ax25_device_event+0x49b/0x500 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+0x304/0x610 dev_change_flags+0xe7/0x190 net/core/dev.c:8897 dev_ifsioc+0x147/0x10c0 net/core/dev_ioctl.c:324 dev_ioctl+0x504/0xf60 net/core/dev_ioctl.c:587 sock_do_ioctl+0x34f/0x5a0 net/socket.c:1154 sock_ioctl+0x47f/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/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 4546: 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+0x4d1/0x500 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_info net/core/dev.c:2018 [inline] call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] dev_close_many+0x37c/0x530 net/core/dev.c:1619 dev_close+0x1b3/0x2b0 net/core/dev.c:1641 bpq_device_event+0x3c3/0x9d0 drivers/net/hamradio/bpqether.c:548 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:2018 [inline] call_netdevice_notifiers_extack net/core/dev.c:2030 [inline] call_netdevice_notifiers net/core/dev.c:2044 [inline] dev_close_many+0x37c/0x530 net/core/dev.c:1619 dev_close+0x1b3/0x2b0 net/core/dev.c:1641 bond_setup_by_slave+0x66/0x390 drivers/net/bonding/bond_main.c:1471 bond_enslave+0x7b1/0x3c20 drivers/net/bonding/bond_main.c:1855 bond_do_ioctl+0x2a1/0xb40 drivers/net/bonding/bond_main.c:4238 dev_ifsioc+0xd7a/0x10c0 net/core/dev_ioctl.c:417 dev_ioctl+0x504/0xf60 net/core/dev_ioctl.c:587 sock_do_ioctl+0x34f/0x5a0 net/socket.c:1154 sock_ioctl+0x47f/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/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888023a96500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 184 bytes inside of 192-byte region [ffff888023a96500, ffff888023a965c0) The buggy address belongs to the page: page:ffffea00008ea580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23a96 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007caec0 0000000b0000000b ffff888017441a00 raw: 0000000000000000 0000000080100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4176, ts 80644645327, free_ts 80642360561 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:5465 __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] __kmalloc_node+0x1fa/0x390 mm/slub.c:4451 kmalloc_array_node include/linux/slab.h:684 [inline] kcalloc_node include/linux/slab.h:689 [inline] memcg_alloc_page_obj_cgroups+0x7e/0x120 mm/memcontrol.c:2836 memcg_slab_post_alloc_hook mm/slab.h:313 [inline] slab_post_alloc_hook+0xb6/0x380 mm/slab.h:526 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 __d_alloc+0x2a/0x700 fs/dcache.c:1749 d_alloc+0x48/0x1d0 fs/dcache.c:1828 lookup_one_qstr_excl+0xca/0x240 fs/namei.c:1559 filename_create+0x293/0x530 fs/namei.c:3836 do_mkdirat+0xb3/0x520 fs/namei.c:4080 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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 mmdrop include/linux/sched/mm.h:49 [inline] finish_task_switch+0x218/0x630 kernel/sched/core.c:4926 context_switch kernel/sched/core.c:5030 [inline] __schedule+0x12cc/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x1bc/0x7b0 kernel/time/hrtimer.c:2047 hrtimer_nanosleep+0x24d/0x490 kernel/time/hrtimer.c:2100 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1313 [inline] __se_sys_clock_nanosleep+0x323/0x3b0 kernel/time/posix-timers.c:1290 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff888023a96480: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff888023a96500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888023a96580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888023a96600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888023a96680: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ==================================================================