================================================================== BUG: KASAN: use-after-free in __wake_up_common+0x255/0x4e0 Read of size 8 at addr ffff888022b394b0 by task syz-executor.3/7661 CPU: 1 PID: 7661 Comm: syz-executor.3 Tainted: G W 5.17.0-syzkaller-02172-g6b1f86f8e9c7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x64/0x400 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 __wake_up_common+0x255/0x4e0 __wake_up_common_lock kernel/sched/wait.c:137 [inline] __wake_up+0x115/0x1c0 kernel/sched/wait.c:156 tty_release+0x4a9/0xef0 drivers/tty/tty_io.c:1781 __fput+0x3fc/0x870 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:190 [inline] exit_to_user_mode_prepare+0x1dd/0x200 kernel/entry/common.c:222 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:315 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f870d03bc8b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffdc2a7e8c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f870d03bc8b RDX: 0000000000000000 RSI: 00007f870cf3b7d8 RDI: 0000000000000003 RBP: 00007f870d19d960 R08: 0000000000000000 R09: 000000008103e29a R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000030408 R13: 00007ffdc2a7e9c0 R14: 00007ffdc2a7e9e0 R15: 0000000000000032 Allocated by task 7649: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:249 [inline] kmem_cache_alloc_trace+0x9d/0x330 mm/slub.c:3271 kmalloc include/linux/slab.h:584 [inline] io_arm_poll_handler+0x3bd/0x710 fs/io_uring.c:6248 io_queue_sqe_arm_apoll fs/io_uring.c:7499 [inline] __io_queue_sqe+0x23d/0x10b0 fs/io_uring.c:7541 io_queue_sqe fs/io_uring.c:7568 [inline] io_submit_sqe fs/io_uring.c:7776 [inline] io_submit_sqes+0x1265/0xb050 fs/io_uring.c:7882 __do_sys_io_uring_enter fs/io_uring.c:10924 [inline] __se_sys_io_uring_enter+0x31f/0x2f50 fs/io_uring.c:10850 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 7: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x136/0x1e0 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:215 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3523 [inline] kfree+0xc6/0x390 mm/slub.c:4576 io_flush_apoll_cache fs/io_uring.c:10038 [inline] io_ring_ctx_free+0x491/0xffe fs/io_uring.c:10064 io_ring_exit_work+0x64d/0x6c5 fs/io_uring.c:10244 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454 kthread+0x2a3/0x2d0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff888022b39480 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 48 bytes inside of 96-byte region [ffff888022b39480, ffff888022b394e0) The buggy address belongs to the page: page:ffffea00008ace40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22b39 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001b29e40 dead000000000004 ffff888011841780 raw: 0000000000000000 0000000000200020 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 3608, ts 72344883556, free_ts 72334000359 prep_new_page mm/page_alloc.c:2382 [inline] get_page_from_freelist+0x708/0xa80 mm/page_alloc.c:4123 __alloc_pages+0x255/0x580 mm/page_alloc.c:5349 alloc_slab_page+0x70/0xf0 mm/slub.c:1799 allocate_slab+0x5d/0x380 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x40e/0xcc0 mm/slub.c:3018 __slab_alloc mm/slub.c:3105 [inline] slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x28c/0x330 mm/slub.c:3269 kmalloc include/linux/slab.h:584 [inline] kzalloc include/linux/slab.h:717 [inline] ipvlan_add_addr drivers/net/ipvlan/ipvlan_main.c:806 [inline] ipvlan_add_addr6 drivers/net/ipvlan/ipvlan_main.c:873 [inline] ipvlan_addr6_event+0x1d9/0x460 drivers/net/ipvlan/ipvlan_main.c:895 notifier_call_chain kernel/notifier.c:84 [inline] atomic_notifier_call_chain+0x157/0x260 kernel/notifier.c:199 ipv6_add_addr+0xf20/0x1410 net/ipv6/addrconf.c:1161 inet6_addr_add+0x5ac/0x1250 net/ipv6/addrconf.c:2967 inet6_rtm_newaddr+0x83d/0x2a90 net/ipv6/addrconf.c:4909 rtnetlink_rcv_msg+0x96f/0xec0 net/core/rtnetlink.c:5596 netlink_rcv_skb+0x200/0x470 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x81a/0x9f0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xaec/0xe60 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] __sys_sendto+0x42e/0x5b0 net/socket.c:2040 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] free_pcp_prepare+0xcbd/0xec0 mm/page_alloc.c:1400 free_unref_page_prepare mm/page_alloc.c:3269 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3364 mm_free_pgd kernel/fork.c:736 [inline] __mmdrop+0xae/0x3f0 kernel/fork.c:787 mmdrop include/linux/sched/mm.h:50 [inline] mmdrop_sched include/linux/sched/mm.h:78 [inline] finish_task_switch+0x221/0x630 kernel/sched/core.c:4978 context_switch kernel/sched/core.c:5076 [inline] __schedule+0x93f/0x1090 kernel/sched/core.c:6382 schedule+0xeb/0x1b0 kernel/sched/core.c:6454 schedule_timeout+0xac/0x300 kernel/time/timer.c:1857 do_wait_for_common+0x3ea/0x560 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion_killable+0x46/0x70 kernel/sched/completion.c:243 call_usermodehelper_exec+0x37a/0x430 kernel/umh.c:440 call_modprobe kernel/kmod.c:98 [inline] __request_module+0x398/0x7a0 kernel/kmod.c:170 dev_ioctl+0x3b2/0xf30 net/core/dev_ioctl.c:512 sock_do_ioctl+0x21e/0x340 net/socket.c:1136 sock_ioctl+0x4a7/0x770 net/socket.c:1239 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff888022b39380: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff888022b39400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff888022b39480: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888022b39500: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff888022b39580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================