Bluetooth: hci3: unexpected event 0x10 length: 23 > 1 Bluetooth: hci3: hardware error 0x6f ================================================================== BUG: KASAN: slab-use-after-free in hci_conn_hash_flush+0x244/0x270 net/bluetooth/hci_conn.c:2470 Read of size 8 at addr ffff888025010000 by task kworker/u19:2/5171 CPU: 3 PID: 5171 Comm: kworker/u19:2 Not tainted 6.4.0-rc3-syzkaller-00081-geb03e3181354 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: hci3 hci_error_reset Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 hci_conn_hash_flush+0x244/0x270 net/bluetooth/hci_conn.c:2470 hci_dev_close_sync+0x5fb/0x1200 net/bluetooth/hci_sync.c:4941 hci_dev_do_close+0x31/0x70 net/bluetooth/hci_core.c:554 hci_error_reset+0xa2/0x140 net/bluetooth/hci_core.c:1059 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 9087: kasan_save_stack+0x22/0x40 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 mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] hci_conn_add+0xb8/0x16b0 net/bluetooth/hci_conn.c:986 hci_connect_sco+0x3c7/0x1050 net/bluetooth/hci_conn.c:1663 sco_connect net/bluetooth/sco.c:264 [inline] sco_sock_connect+0x2d7/0xae0 net/bluetooth/sco.c:610 __sys_connect_file+0x153/0x1a0 net/socket.c:2003 __sys_connect+0x165/0x1a0 net/socket.c:2020 __do_sys_connect net/socket.c:2030 [inline] __se_sys_connect net/socket.c:2027 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2027 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5171: kasan_save_stack+0x22/0x40 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:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] __cache_free mm/slab.c:3389 [inline] __do_kmem_cache_free mm/slab.c:3576 [inline] __kmem_cache_free+0xcd/0x2c0 mm/slab.c:3583 device_release+0xa3/0x240 drivers/base/core.c:2484 kobject_cleanup lib/kobject.c:683 [inline] kobject_release lib/kobject.c:714 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:731 put_device+0x1f/0x30 drivers/base/core.c:3733 hci_conn_del+0x1e5/0x950 net/bluetooth/hci_conn.c:1162 hci_conn_unlink+0x2ce/0x460 net/bluetooth/hci_conn.c:1109 hci_conn_unlink+0x362/0x460 net/bluetooth/hci_conn.c:1087 hci_conn_hash_flush+0x19b/0x270 net/bluetooth/hci_conn.c:2479 hci_dev_close_sync+0x5fb/0x1200 net/bluetooth/hci_sync.c:4941 hci_dev_do_close+0x31/0x70 net/bluetooth/hci_core.c:554 hci_error_reset+0xa2/0x140 net/bluetooth/hci_core.c:1059 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:491 insert_work+0x48/0x360 kernel/workqueue.c:1365 __queue_work+0x625/0x1120 kernel/workqueue.c:1526 __queue_delayed_work+0x1c8/0x270 kernel/workqueue.c:1674 queue_delayed_work_on+0x109/0x120 kernel/workqueue.c:1710 queue_delayed_work include/linux/workqueue.h:520 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1444 [inline] hci_conn_drop include/net/bluetooth/hci_core.h:1414 [inline] sco_chan_del+0x1f8/0x4f0 net/bluetooth/sco.c:169 __sco_sock_close+0x178/0x740 net/bluetooth/sco.c:454 sco_sock_close net/bluetooth/sco.c:469 [inline] sco_sock_release+0x81/0x360 net/bluetooth/sco.c:1267 __sock_release+0xcd/0x290 net/socket.c:653 sock_close+0x1c/0x20 net/socket.c:1397 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 get_signal+0x1c7/0x25b0 kernel/signal.c:2650 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 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:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888025010000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes inside of freed 4096-byte region [ffff888025010000, ffff888025011000) The buggy address belongs to the physical page: page:ffffea0000940400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x25010 head:ffffea0000940400 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0x1() raw: 00fff00000010200 ffff888012440900 ffffea00018e3110 ffffea000199e990 raw: 0000000000000000 ffff888025010000 0000000100000001 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 0x2c2020(__GFP_HIGH|__GFP_NOWARN|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_THISNODE), pid 5209, tgid 5209 (kworker/0:4), ts 260774146061, free_ts 260745889830 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages_slowpath.constprop.0+0x2e7/0x2170 mm/page_alloc.c:4302 __alloc_pages+0x408/0x4a0 mm/page_alloc.c:4781 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1360 [inline] cache_grow_begin+0x9b/0x3b0 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3018 [inline] ____cache_alloc mm/slab.c:3001 [inline] __do_cache_alloc mm/slab.c:3201 [inline] slab_alloc_node mm/slab.c:3249 [inline] __kmem_cache_alloc_node+0x360/0x3f0 mm/slab.c:3540 __do_kmalloc_node mm/slab_common.c:965 [inline] __kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:986 kmalloc_reserve+0xf0/0x270 net/core/skbuff.c:585 __alloc_skb+0x129/0x330 net/core/skbuff.c:654 alloc_skb include/linux/skbuff.h:1288 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:751 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:808 [inline] nsim_dev_trap_report_work+0x2b1/0xc80 drivers/net/netdevsim/dev.c:853 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page+0x33/0x370 mm/page_alloc.c:2659 slab_destroy mm/slab.c:1612 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1632 cache_flusharray mm/slab.c:3360 [inline] ___cache_free+0x2ae/0x3d0 mm/slab.c:3423 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:711 [inline] slab_alloc_node mm/slab.c:3256 [inline] __kmem_cache_alloc_node+0x1fc/0x3f0 mm/slab.c:3540 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1057 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:680 [inline] ref_tracker_alloc+0x158/0x580 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:4070 [inline] netdev_hold include/linux/netdevice.h:4099 [inline] netdev_hold include/linux/netdevice.h:4094 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1691 [inline] netdev_queue_update_kobjects+0x1ab/0x4f0 net/core/net-sysfs.c:1746 register_queue_kobjects net/core/net-sysfs.c:1807 [inline] netdev_register_kobject+0x334/0x400 net/core/net-sysfs.c:2047 register_netdevice+0xd77/0x1640 net/core/dev.c:10085 __ip_tunnel_create+0x398/0x5b0 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x1f9/0x5d0 net/ipv4/ip_tunnel.c:1091 ops_init+0xb9/0x6b0 net/core/net_namespace.c:136 Memory state around the buggy address: ffff88802500ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802500ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888025010000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888025010080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888025010100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================