Bluetooth: hci2: link tx timeout Bluetooth: hci2: killing stalled connection 11:aa:aa:aa:aa:aa ================================================================== BUG: KASAN: slab-use-after-free in hci_disconnect+0x208/0x2d0 net/bluetooth/hci_conn.c:190 Read of size 1 at addr ffff888063da4039 by task kworker/u9:0/12299 CPU: 0 PID: 12299 Comm: kworker/u9:0 Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: hci2 hci_tx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 hci_disconnect+0x208/0x2d0 net/bluetooth/hci_conn.c:190 hci_link_tx_to net/bluetooth/hci_core.c:3495 [inline] __check_timeout+0x3a8/0x560 net/bluetooth/hci_core.c:3642 hci_sched_le net/bluetooth/hci_core.c:3825 [inline] hci_tx_work+0x139b/0x1ef0 net/bluetooth/hci_core.c:3903 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5092: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x1db/0x360 mm/slub.c:3997 kmalloc include/linux/slab.h:628 [inline] kzalloc include/linux/slab.h:749 [inline] hci_conn_add+0xc7/0x13a0 net/bluetooth/hci_conn.c:914 le_conn_complete_evt+0x303/0x12f0 net/bluetooth/hci_event.c:5771 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5923 hci_event_func net/bluetooth/hci_event.c:7539 [inline] hci_event_packet+0xa53/0x1540 net/bluetooth/hci_event.c:7594 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4171 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 5092: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x153/0x3a0 mm/slub.c:4390 device_release+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 hci_conn_cleanup net/bluetooth/hci_conn.c:176 [inline] hci_conn_del+0x900/0xc80 net/bluetooth/hci_conn.c:1126 hci_abort_conn_sync+0x583/0xde0 net/bluetooth/hci_sync.c:5567 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:310 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888063da4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 57 bytes inside of freed 8192-byte region [ffff888063da4000, ffff888063da6000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x63da0 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff80000000840(slab|head|node=0|zone=1|lastcpupid=0xfff) page_type: 0xffffffff() raw: 00fff80000000840 ffff888015042280 ffffea00007cae00 dead000000000002 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff80000000840 ffff888015042280 ffffea00007cae00 dead000000000002 head: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff80000000003 ffffea00018f6801 dead000000000122 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 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 7154, tgid 1104498093 (syz-executor.2), ts 7154, free_ts 172893134475 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2175 allocate_slab mm/slub.c:2338 [inline] new_slab+0x84/0x2f0 mm/slub.c:2391 ___slab_alloc+0xc73/0x1260 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc_node+0x2db/0x4e0 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0x72/0x190 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] kvmalloc_array include/linux/slab.h:784 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x389/0x6e0 net/sched/sch_generic.c:860 qdisc_create_dflt+0x136/0x4b0 net/sched/sch_generic.c:1007 attach_one_default_qdisc net/sched/sch_generic.c:1165 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2500 [inline] attach_default_qdiscs net/sched/sch_generic.c:1183 [inline] dev_activate+0x3c0/0x1240 net/sched/sch_generic.c:1242 __dev_open+0x352/0x450 net/core/dev.c:1439 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:8692 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8764 do_setlink+0xccd/0x41f0 net/core/rtnetlink.c:2884 __rtnl_newlink net/core/rtnetlink.c:3680 [inline] rtnl_newlink+0x180b/0x20a0 net/core/rtnetlink.c:3727 page last free pid 5421 tgid 5421 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x97b/0xaa0 mm/page_alloc.c:2347 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487 discard_slab mm/slub.c:2437 [inline] __put_partials+0xeb/0x130 mm/slub.c:2906 put_cpu_partial+0x17c/0x250 mm/slub.c:2981 __slab_free+0x2ea/0x3d0 mm/slub.c:4151 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x5e/0xc0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x1e2/0x4a0 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x23a/0x880 security/tomoyo/file.c:723 security_file_ioctl+0x75/0xb0 security/security.c:2764 __do_sys_ioctl fs/ioctl.c:898 [inline] __se_sys_ioctl+0x47/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888063da3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888063da3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888063da4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888063da4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888063da4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================