================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x79/0x1f60 kernel/locking/lockdep.c:4923 Read of size 8 at addr ffff88807b64e130 by task syz-executor.5/4602 CPU: 1 PID: 4602 Comm: syz-executor.5 Not tainted 6.0.0-rc2-syzkaller-00044-gdf0219d11b6f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 __lock_acquire+0x79/0x1f60 kernel/locking/lockdep.c:4923 lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666 lock_sock_nested+0x44/0xf0 net/core/sock.c:3391 lock_sock include/net/sock.h:1712 [inline] nr_accept+0x510/0x660 net/netrom/af_netrom.c:805 do_accept+0x4d0/0x6d0 net/socket.c:1856 __sys_accept4_file net/socket.c:1897 [inline] __sys_accept4+0x97/0x100 net/socket.c:1927 __do_sys_accept net/socket.c:1944 [inline] __se_sys_accept net/socket.c:1941 [inline] __x64_sys_accept+0x79/0x90 net/socket.c:1941 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+0x63/0xcd RIP: 0033:0x7f8201089279 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8202159168 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: ffffffffffffffda RBX: 00007f820119c050 RCX: 00007f8201089279 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f82010e3189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffc989b36f R14: 00007f8202159300 R15: 0000000000022000 Allocated by task 4595: 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:437 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x226/0x370 mm/slub.c:4424 kmalloc include/linux/slab.h:605 [inline] sk_prot_alloc+0xde/0x200 net/core/sock.c:1976 sk_alloc+0x36/0x340 net/core/sock.c:2029 nr_create+0x9d/0x500 net/netrom/af_netrom.c:433 __sock_create+0x3fd/0x850 net/socket.c:1515 sock_create net/socket.c:1566 [inline] __sys_socket_create net/socket.c:1603 [inline] __sys_socket+0x137/0x3a0 net/socket.c:1636 __do_sys_socket net/socket.c:1649 [inline] __se_sys_socket net/socket.c:1647 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1647 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+0x63/0xcd Freed by task 4614: 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+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xda/0x210 mm/slub.c:4562 sk_prot_free net/core/sock.c:2012 [inline] __sk_destruct+0x487/0x5d0 net/core/sock.c:2098 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers+0x76a/0x980 kernel/time/timer.c:1790 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803 __do_softirq+0x382/0x793 kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2793 netlink_release+0x12fc/0x1720 net/netlink/af_netlink.c:815 __sock_release net/socket.c:650 [inline] sock_close+0xd7/0x260 net/socket.c:1365 __fput+0x3b9/0x820 fs/file_table.c:320 task_work_run+0x146/0x1c0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0xa31/0xce0 kernel/workqueue.c:1517 queue_work_on+0x137/0x240 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] schedule_work include/linux/workqueue.h:564 [inline] rfkill_register+0x723/0x880 net/rfkill/core.c:1090 hci_register_dev+0x3d0/0xa30 net/bluetooth/hci_core.c:2603 __vhci_create_device drivers/bluetooth/hci_vhci.c:336 [inline] vhci_create_device+0x3b7/0x6e0 drivers/bluetooth/hci_vhci.c:374 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88807b64e000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 304 bytes inside of 2048-byte region [ffff88807b64e000, ffff88807b64e800) The buggy address belongs to the physical page: page:ffffea0001ed9200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b648 head:ffffea0001ed9200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012042000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 22, tgid 22 (kworker/1:0), ts 69058537180, free_ts 67886448364 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515 alloc_slab_page+0x70/0xf0 mm/slub.c:1824 allocate_slab+0x5e/0x520 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3031 __slab_alloc mm/slub.c:3118 [inline] slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2bd/0x3f0 mm/slub.c:4955 kmalloc_reserve net/core/skbuff.c:358 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:430 alloc_skb include/linux/skbuff.h:1257 [inline] alloc_skb_with_frags+0xaf/0x810 net/core/skbuff.c:6018 sock_alloc_send_pskb+0x930/0xa70 net/core/sock.c:2663 sock_alloc_send_skb include/net/sock.h:1866 [inline] mld_newpack+0x1e0/0xa90 net/ipv6/mcast.c:1748 add_grhead+0x5e/0x290 net/ipv6/mcast.c:1851 add_grec+0x14c9/0x17c0 net/ipv6/mcast.c:1989 mld_send_initial_cr+0x1f6/0x370 net/ipv6/mcast.c:2236 mld_dad_work+0x3c/0x3f0 net/ipv6/mcast.c:2262 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 free_slab mm/slub.c:2068 [inline] discard_slab mm/slub.c:2074 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2548 put_cpu_partial+0x116/0x180 mm/slub.c:2624 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmalloc+0x1bd/0x370 mm/slub.c:4420 kmalloc include/linux/slab.h:605 [inline] tomoyo_realpath_from_path+0xd8/0x5f0 security/tomoyo/realpath.c:254 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x270/0x6b0 security/tomoyo/file.c:822 security_inode_getattr+0xc0/0x140 security/security.c:1345 vfs_getattr+0x26/0x360 fs/stat.c:157 vfs_fstat fs/stat.c:182 [inline] __do_sys_newfstat fs/stat.c:435 [inline] __se_sys_newfstat+0xda/0x800 fs/stat.c:432 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+0x63/0xcd Memory state around the buggy address: ffff88807b64e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b64e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807b64e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b64e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b64e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================