================================================================== BUG: KASAN: slab-use-after-free in sco_chan_del net/bluetooth/sco.c:170 [inline] BUG: KASAN: slab-use-after-free in __sco_sock_close+0x274/0x788 net/bluetooth/sco.c:456 Read of size 8 at addr ffff0000c7299400 by task syz-executor661/9434 CPU: 1 PID: 9434 Comm: syz-executor661 Not tainted 6.6.0-rc7-syzkaller-00089-g8de1e7afcc1c-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x174/0x514 mm/kasan/report.c:475 kasan_report+0xd8/0x138 mm/kasan/report.c:588 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 sco_chan_del net/bluetooth/sco.c:170 [inline] __sco_sock_close+0x274/0x788 net/bluetooth/sco.c:456 sco_sock_close net/bluetooth/sco.c:471 [inline] sco_sock_release+0xb4/0x2c0 net/bluetooth/sco.c:1248 __sock_release net/socket.c:659 [inline] sock_close+0xa4/0x1e8 net/socket.c:1419 __fput+0x324/0x7f8 fs/file_table.c:384 ____fput+0x20/0x30 fs/file_table.c:412 task_work_run+0x230/0x2e0 kernel/task_work.c:180 get_signal+0x13f4/0x15ec kernel/signal.c:2668 do_signal arch/arm64/kernel/signal.c:1249 [inline] do_notify_resume+0x3bc/0x393c arch/arm64/kernel/signal.c:1302 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0x9c/0x158 arch/arm64/kernel/entry-common.c:679 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Allocated by task 9431: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:511 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:198 [inline] kmalloc_trace+0x70/0x88 mm/slab_common.c:1122 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] sco_conn_add+0xc4/0x2cc net/bluetooth/sco.c:134 sco_connect net/bluetooth/sco.c:274 [inline] sco_sock_connect+0x2a0/0x848 net/bluetooth/sco.c:593 __sys_connect_file net/socket.c:2050 [inline] __sys_connect+0x268/0x290 net/socket.c:2067 __do_sys_connect net/socket.c:2077 [inline] __se_sys_connect net/socket.c:2074 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:2074 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 Freed by task 6094: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x7c mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:522 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook mm/slub.c:1826 [inline] slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0x2ac/0x480 mm/slub.c:3822 kfree+0xb8/0x19c mm/slab_common.c:1075 sco_conn_del+0x3b4/0x498 net/bluetooth/sco.c:210 sco_connect_cfm+0xf0/0x948 net/bluetooth/sco.c:1363 hci_connect_cfm include/net/bluetooth/hci_core.h:1935 [inline] hci_conn_failed+0x17c/0x2c0 net/bluetooth/hci_conn.c:1251 hci_abort_conn_sync+0x688/0xe38 net/bluetooth/hci_sync.c:5428 abort_conn_sync+0x5c/0x8c net/bluetooth/hci_conn.c:2910 hci_cmd_sync_work+0x1cc/0x34c net/bluetooth/hci_sync.c:306 process_one_work+0x694/0x1204 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2784 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:492 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:502 kvfree_call_rcu+0xac/0x674 kernel/rcu/tree.c:3372 drop_sysctl_table+0x2c8/0x410 fs/proc/proc_sysctl.c:1508 drop_sysctl_table+0x2d8/0x410 fs/proc/proc_sysctl.c:1511 unregister_sysctl_table+0x48/0x68 fs/proc/proc_sysctl.c:1529 unregister_net_sysctl_table+0x20/0x30 net/sysctl_net.c:185 mpls_dev_sysctl_unregister+0x88/0xc0 net/mpls/af_mpls.c:1447 mpls_dev_notify+0x448/0x654 net/mpls/af_mpls.c:1659 notifier_call_chain+0x1a4/0x510 kernel/notifier.c:93 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:461 call_netdevice_notifiers_info net/core/dev.c:1995 [inline] call_netdevice_notifiers_extack net/core/dev.c:2033 [inline] call_netdevice_notifiers net/core/dev.c:2047 [inline] unregister_netdevice_many_notify+0xd44/0x17a8 net/core/dev.c:10967 unregister_netdevice_many net/core/dev.c:11023 [inline] default_device_exit_batch+0x6c8/0x744 net/core/dev.c:11492 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x5dc/0x8d0 net/core/net_namespace.c:614 process_one_work+0x694/0x1204 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2784 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 The buggy address belongs to the object at ffff0000c7299400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of freed 256-byte region [ffff0000c7299400, ffff0000c7299500) The buggy address belongs to the physical page: page:0000000073a3d90c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107298 head:0000000073a3d90c order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c0001b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c7299300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c7299380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c7299400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c7299480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c7299500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================