Bluetooth: hci3: hardware error 0x00 ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_long_read include/linux/atomic/atomic-instrumented.h:1265 [inline] BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0xa6/0x5e0 kernel/locking/mutex.c:916 Read of size 8 at addr ffff8880451634b8 by task kworker/u5:4/3648 CPU: 0 PID: 3648 Comm: kworker/u5:4 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: hci3 hci_error_reset Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:1265 [inline] __mutex_unlock_slowpath+0xa6/0x5e0 kernel/locking/mutex.c:916 l2cap_chan_unlock include/net/bluetooth/l2cap.h:860 [inline] l2cap_conn_del+0x404/0x7b0 net/bluetooth/l2cap_core.c:1932 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:8221 [inline] l2cap_disconn_cfm+0x8c/0xc0 net/bluetooth/l2cap_core.c:8214 hci_disconn_cfm include/net/bluetooth/hci_core.h:1787 [inline] hci_conn_hash_flush+0x122/0x260 net/bluetooth/hci_conn.c:2430 hci_dev_close_sync+0x5f7/0x1200 net/bluetooth/hci_sync.c:4824 hci_dev_do_close+0x2d/0x70 net/bluetooth/hci_core.c:554 hci_error_reset+0x9e/0x140 net/bluetooth/hci_core.c:1059 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 3645: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] l2cap_chan_create+0x40/0x930 net/bluetooth/l2cap_core.c:466 a2mp_chan_open net/bluetooth/a2mp.c:771 [inline] amp_mgr_create+0x8f/0x960 net/bluetooth/a2mp.c:862 a2mp_channel_create+0x7d/0x150 net/bluetooth/a2mp.c:894 l2cap_data_channel net/bluetooth/l2cap_core.c:7578 [inline] l2cap_recv_frame+0x51e5/0x9aa0 net/bluetooth/l2cap_core.c:7733 l2cap_recv_acldata+0xaa6/0xc00 net/bluetooth/l2cap_core.c:8438 hci_acldata_packet net/bluetooth/hci_core.c:3809 [inline] hci_rx_work+0x705/0x1230 net/bluetooth/hci_core.c:4044 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 3648: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:367 [inline] ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xe2/0x580 mm/slub.c:4567 l2cap_chan_destroy net/bluetooth/l2cap_core.c:509 [inline] kref_put include/linux/kref.h:65 [inline] l2cap_chan_put+0x22a/0x2d0 net/bluetooth/l2cap_core.c:533 l2cap_conn_del+0x3fc/0x7b0 net/bluetooth/l2cap_core.c:1930 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:8221 [inline] l2cap_disconn_cfm+0x8c/0xc0 net/bluetooth/l2cap_core.c:8214 hci_disconn_cfm include/net/bluetooth/hci_core.h:1787 [inline] hci_conn_hash_flush+0x122/0x260 net/bluetooth/hci_conn.c:2430 hci_dev_close_sync+0x5f7/0x1200 net/bluetooth/hci_sync.c:4824 hci_dev_do_close+0x2d/0x70 net/bluetooth/hci_core.c:554 hci_error_reset+0x9e/0x140 net/bluetooth/hci_core.c:1059 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff888045163000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1208 bytes inside of 2048-byte region [ffff888045163000, ffff888045163800) The buggy address belongs to the physical page: page:ffffea0001145800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45160 head:ffffea0001145800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e33e00 dead000000000002 ffff888011842000 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 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6048, tgid 6047 (syz-executor.2), ts 244735982444, free_ts 244728344737 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1829 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x84f/0xe80 mm/slub.c:3036 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123 slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] __kmalloc_track_caller+0x325/0x340 mm/slub.c:4931 kmemdup+0x23/0x50 mm/util.c:129 kmemdup include/linux/fortify-string.h:565 [inline] sctp_process_param net/sctp/sm_make_chunk.c:2641 [inline] sctp_process_init+0x1296/0x2a40 net/sctp/sm_make_chunk.c:2396 sctp_cmd_process_init net/sctp/sm_sideeffect.c:706 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1387 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0xd5a/0x4ec0 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x386/0x6c0 net/sctp/associola.c:1053 sctp_inq_push+0x1d2/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x196/0x5a0 net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2906 release_sock+0x54/0x1b0 net/core/sock.c:3462 sctp_wait_for_connect+0x416/0x5c0 net/sctp/socket.c:9310 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+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2553 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 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:3248 [inline] slab_alloc mm/slub.c:3256 [inline] __kmem_cache_alloc_lru mm/slub.c:3263 [inline] kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3273 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9a/0xe0 include/linux/audit.h:320 user_path_at_empty+0x2b/0x60 fs/namei.c:2875 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1822 [inline] __do_sys_umount fs/namespace.c:1830 [inline] __se_sys_umount fs/namespace.c:1828 [inline] __x64_sys_umount+0xf8/0x180 fs/namespace.c:1828 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888045163380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888045163400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888045163480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888045163500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888045163580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================