Bluetooth: hci2: link tx timeout Bluetooth: hci2: killing stalled connection 11:aa:aa:aa:aa:aa 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+0x207/0x220 net/bluetooth/hci_conn.c:190 Read of size 8 at addr ffff88807cc0c038 by task kworker/u9:8/5127 CPU: 0 PID: 5127 Comm: kworker/u9:8 Not tainted 6.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: hci2 hci_tx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 hci_disconnect+0x207/0x220 net/bluetooth/hci_conn.c:190 hci_link_tx_to net/bluetooth/hci_core.c:3470 [inline] __check_timeout net/bluetooth/hci_core.c:3611 [inline] __check_timeout+0x3fe/0x730 net/bluetooth/hci_core.c:3591 hci_sched_le net/bluetooth/hci_core.c:3728 [inline] hci_tx_work+0x6e2/0x1540 net/bluetooth/hci_core.c:3806 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 10473: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:660 [inline] kzalloc_noprof include/linux/slab.h:778 [inline] hci_conn_add+0x135/0x1a50 net/bluetooth/hci_conn.c:935 hci_conn_add_unset+0x6d/0x100 net/bluetooth/hci_conn.c:1044 le_conn_complete_evt+0x790/0x1d80 net/bluetooth/hci_event.c:5635 hci_le_conn_complete_evt+0x23c/0x370 net/bluetooth/hci_event.c:5787 hci_le_meta_evt+0x2e2/0x5d0 net/bluetooth/hci_event.c:7106 hci_event_func net/bluetooth/hci_event.c:7414 [inline] hci_event_packet+0x664/0x1170 net/bluetooth/hci_event.c:7469 hci_rx_work+0x2c4/0x1610 net/bluetooth/hci_core.c:4074 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 10473: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x12a/0x3b0 mm/slub.c:4558 device_release+0xa1/0x240 drivers/base/core.c:2581 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1fa/0x5b0 lib/kobject.c:737 put_device drivers/base/core.c:3787 [inline] device_unregister+0x2f/0xc0 drivers/base/core.c:3910 hci_conn_del_sysfs+0xb4/0x180 net/bluetooth/hci_sysfs.c:86 hci_conn_cleanup net/bluetooth/hci_conn.c:176 [inline] hci_conn_del+0x54e/0xdb0 net/bluetooth/hci_conn.c:1154 hci_abort_conn_sync+0x75a/0xb50 net/bluetooth/hci_sync.c:5450 abort_conn_sync+0x197/0x360 net/bluetooth/hci_conn.c:2909 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:310 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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 ffff88807cc0c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 56 bytes inside of freed 8192-byte region [ffff88807cc0c000, ffff88807cc0e000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7cc08 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff888015442280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000020002 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff888015442280 dead000000000100 dead000000000122 head: 0000000000000000 0000000000020002 00000001ffffefff 0000000000000000 head: 00fff00000000003 ffffea0001f30201 ffffffffffffffff 0000000000000000 head: 0000000000000008 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4747, tgid 4747 (dhcpcd), ts 71154128907, free_ts 71104884480 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468 prep_new_page mm/page_alloc.c:1476 [inline] get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4142 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:597 __alloc_skb+0x164/0x380 net/core/skbuff.c:666 alloc_skb include/linux/skbuff.h:1308 [inline] netlink_dump+0x2b2/0xe00 net/netlink/af_netlink.c:2297 netlink_recvmsg+0xa0d/0xf30 net/netlink/af_netlink.c:1987 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0x1f6/0x250 net/socket.c:1068 ____sys_recvmsg+0x21f/0x6b0 net/socket.c:2804 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2846 __sys_recvmsg+0x114/0x1e0 net/socket.c:2876 page last free pid 4747 tgid 4747 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1088 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583 __put_partials+0x14c/0x170 mm/slub.c:2995 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_kmalloc_large+0x86/0x90 mm/kasan/common.c:419 __do_kmalloc_node mm/slub.c:4110 [inline] __kmalloc_node_noprof.cold+0x5/0x5f mm/slub.c:4129 kmalloc_node_noprof include/linux/slab.h:681 [inline] kvmalloc_node_noprof+0x6f/0x1a0 mm/util.c:634 proc_sys_call_handler+0x3a2/0x6f0 fs/proc/proc_sysctl.c:575 new_sync_read fs/read_write.c:395 [inline] vfs_read+0x869/0xbd0 fs/read_write.c:476 ksys_read+0x12f/0x260 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807cc0bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807cc0bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807cc0c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807cc0c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807cc0c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================