================================================================== BUG: KASAN: slab-use-after-free in sco_chan_del+0x487/0x4f0 net/bluetooth/sco.c:170 Read of size 8 at addr ffff88801e27c000 by task syz-executor.3/9429 CPU: 1 PID: 9429 Comm: syz-executor.3 Not tainted 6.6.0-rc3-next-20230926-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 sco_chan_del+0x487/0x4f0 net/bluetooth/sco.c:170 __sco_sock_close+0xf2/0x690 net/bluetooth/sco.c:454 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x6f/0x2c0 net/bluetooth/sco.c:1246 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1402 __fput+0x3f7/0xa70 fs/file_table.c:384 task_work_run+0x14d/0x240 kernel/task_work.c:180 get_signal+0x106f/0x2790 kernel/signal.c:2680 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f8475c7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f84769100c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f8475d9bf80 RCX: 00007f8475c7cae9 RDX: 0000000000000008 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f8475cc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f8475d9bf80 R15: 00007fff747aac28 Allocated by task 9429: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] sco_conn_add+0xe2/0x360 net/bluetooth/sco.c:134 sco_connect net/bluetooth/sco.c:273 [inline] sco_sock_connect+0x2f3/0xa80 net/bluetooth/sco.c:591 __sys_connect_file+0x15b/0x1a0 net/socket.c:2033 __sys_connect+0x145/0x170 net/socket.c:2050 __do_sys_connect net/socket.c:2060 [inline] __se_sys_connect net/socket.c:2057 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2057 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5105: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2d0 mm/slub.c:3822 sco_conn_del+0x1e3/0x2d0 net/bluetooth/sco.c:210 sco_connect_cfm+0x205/0xb70 net/bluetooth/sco.c:1361 hci_connect_cfm include/net/bluetooth/hci_core.h:1958 [inline] hci_conn_failed+0x1c3/0x370 net/bluetooth/hci_conn.c:1259 hci_conn_cleanup_child net/bluetooth/hci_conn.c:1067 [inline] hci_conn_unlink+0x71b/0x9e0 net/bluetooth/hci_conn.c:1094 hci_conn_del+0x59/0xd80 net/bluetooth/hci_conn.c:1120 hci_abort_conn_sync+0x7ed/0xb60 net/bluetooth/hci_sync.c:5427 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2909 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3372 drop_sysctl_table+0x1d4/0x3b0 fs/proc/proc_sysctl.c:1508 unregister_sysctl_table fs/proc/proc_sysctl.c:1529 [inline] unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1521 sctp_sysctl_net_unregister+0x5a/0x80 net/sctp/sysctl.c:630 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3372 drop_sysctl_table+0x1d4/0x3b0 fs/proc/proc_sysctl.c:1508 unregister_sysctl_table fs/proc/proc_sysctl.c:1529 [inline] unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1521 __devinet_sysctl_unregister net/ipv4/devinet.c:2630 [inline] devinet_exit_net+0xe8/0x280 net/ipv4/devinet.c:2774 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff88801e27c000 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of freed 256-byte region [ffff88801e27c000, ffff88801e27c100) The buggy address belongs to the physical page: page:ffffea0000789f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e27c head:ffffea0000789f00 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888012c41b40 ffffea0001eb8780 dead000000000002 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5104, tgid 5104 (syz-executor.5), ts 237987973997, free_ts 232245739293 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530 prep_new_page mm/page_alloc.c:1537 [inline] get_page_from_freelist+0xf17/0x2e50 mm/page_alloc.c:3200 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4456 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2304 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x131/0x330 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc+0x4f/0x100 mm/slab_common.c:1036 kmalloc include/linux/slab.h:603 [inline] kzalloc include/linux/slab.h:720 [inline] new_dir fs/proc/proc_sysctl.c:966 [inline] get_subdir fs/proc/proc_sysctl.c:1010 [inline] sysctl_mkdir_p fs/proc/proc_sysctl.c:1301 [inline] __register_sysctl_table+0xdaf/0x1700 fs/proc/proc_sysctl.c:1382 neigh_sysctl_register+0x321/0x650 net/core/neighbour.c:3847 devinet_sysctl_register+0xaa/0x220 net/ipv4/devinet.c:2644 inetdev_init+0x286/0x570 net/ipv4/devinet.c:286 inetdev_event+0x1156/0x1900 net/ipv4/devinet.c:1555 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1970 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1130 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2342 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2435 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x195/0x330 mm/slub.c:3517 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1114 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] kobject_uevent_env+0x24c/0x1800 lib/kobject_uevent.c:524 __kobject_del+0x151/0x1e0 lib/kobject.c:598 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:716 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x257/0x440 lib/kobject.c:733 netdev_queue_update_kobjects+0x39f/0x520 net/core/net-sysfs.c:1762 netif_set_real_num_tx_queues+0x17c/0x8a0 net/core/dev.c:2913 veth_init_queues+0xdd/0x190 drivers/net/veth.c:1834 veth_newlink+0x61c/0xa00 drivers/net/veth.c:1957 rtnl_newlink_create net/core/rtnetlink.c:3521 [inline] __rtnl_newlink+0x1177/0x1940 net/core/rtnetlink.c:3741 rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3754 Memory state around the buggy address: ffff88801e27bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801e27bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801e27c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801e27c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e27c100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================