================================================================== BUG: KASAN: slab-use-after-free in hci_send_acl+0x9f8/0xac0 net/bluetooth/hci_core.c:3234 Read of size 8 at addr ffff888027bb0518 by task kworker/1:2/1784 CPU: 1 PID: 1784 Comm: kworker/1:2 Not tainted 6.7.0-rc3-syzkaller-00690-g8470e4368b0f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events l2cap_info_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 hci_send_acl+0x9f8/0xac0 net/bluetooth/hci_core.c:3234 l2cap_send_cmd+0x6dd/0x920 net/bluetooth/l2cap_core.c:977 l2cap_send_conn_req+0x1e5/0x260 net/bluetooth/l2cap_core.c:1286 l2cap_start_connection+0x11e/0x420 net/bluetooth/l2cap_core.c:1514 l2cap_conn_start+0x7ae/0xa40 net/bluetooth/l2cap_core.c:1661 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Allocated by task 12603: kasan_save_stack+0x33/0x50 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+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] hci_chan_create+0xa6/0x3d0 net/bluetooth/hci_conn.c:2770 l2cap_conn_add.part.0+0x1a/0xdf0 net/bluetooth/l2cap_core.c:7841 l2cap_conn_add include/net/bluetooth/hci_core.h:1545 [inline] l2cap_chan_connect+0x15de/0x2170 net/bluetooth/l2cap_core.c:8053 l2cap_sock_connect+0x33f/0x720 net/bluetooth/l2cap_sock.c:256 kernel_connect+0x103/0x170 net/socket.c:3625 rfcomm_session_create net/bluetooth/rfcomm/core.c:811 [inline] __rfcomm_dlc_open net/bluetooth/rfcomm/core.c:388 [inline] rfcomm_dlc_open+0x81f/0xaa0 net/bluetooth/rfcomm/core.c:431 rfcomm_sock_connect+0x430/0x640 net/bluetooth/rfcomm/sock.c:409 __sys_connect_file+0x15b/0x1a0 net/socket.c:2046 __sys_connect+0x145/0x170 net/socket.c:2063 __do_sys_connect net/socket.c:2073 [inline] __se_sys_connect net/socket.c:2070 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2070 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 9397: kasan_save_stack+0x33/0x50 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:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xc0/0x180 mm/slub.c:3822 hci_chan_list_flush+0x81/0xf0 net/bluetooth/hci_conn.c:2810 hci_conn_cleanup net/bluetooth/hci_conn.c:152 [inline] hci_conn_del+0x209/0xe10 net/bluetooth/hci_conn.c:1182 hci_abort_conn_sync+0x758/0xb50 net/bluetooth/hci_sync.c:5424 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2957 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3400 __hw_addr_del_entry+0x211/0x390 net/core/dev_addr_lists.c:161 __hw_addr_del_ex+0x1cc/0x230 net/core/dev_addr_lists.c:200 __dev_mc_del net/core/dev_addr_lists.c:908 [inline] dev_mc_del+0xba/0x100 net/core/dev_addr_lists.c:926 ip_mc_filter_del net/ipv4/igmp.c:1168 [inline] __igmp_group_dropped+0xbc3/0xfe0 net/ipv4/igmp.c:1301 __ip_mc_dec_group+0x413/0x570 net/ipv4/igmp.c:1691 br_ip4_multicast_leave_snoopers.isra.0+0x152/0x420 net/bridge/br_multicast.c:4129 br_multicast_leave_snoopers+0x8c/0x120 net/bridge/br_multicast.c:4149 br_dev_stop+0x116/0x150 net/bridge/br_device.c:205 __dev_close_many+0x1b6/0x2f0 net/core/dev.c:1531 dev_close_many+0x22c/0x640 net/core/dev.c:1556 unregister_netdevice_many_notify+0x41e/0x19a0 net/core/dev.c:11013 unregister_netdevice_many net/core/dev.c:11096 [inline] default_device_exit_batch+0x481/0x5f0 net/core/dev.c:11567 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3400 kernfs_unlink_open_file+0x3b6/0x4b0 fs/kernfs/file.c:584 kernfs_fop_release+0xec/0x1e0 fs/kernfs/file.c:756 __fput+0x270/0xbb0 fs/file_table.c:394 __fput_sync+0x47/0x50 fs/file_table.c:475 __do_sys_close fs/open.c:1590 [inline] __se_sys_close fs/open.c:1575 [inline] __x64_sys_close+0x87/0xf0 fs/open.c:1575 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff888027bb0500 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 24 bytes inside of freed 128-byte region [ffff888027bb0500, ffff888027bb0580) The buggy address belongs to the physical page: page:ffffea00009eec00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27bb0 ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff8880130418c0 ffffea0000a4e240 dead000000000003 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4513, tgid 4513 (udevd), ts 227858218444, free_ts 227852362585 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1544 prep_new_page mm/page_alloc.c:1551 [inline] get_page_from_freelist+0xa28/0x3730 mm/page_alloc.c:3319 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_slab_page mm/slub.c:1872 [inline] allocate_slab mm/slub.c:2017 [inline] new_slab+0xca/0x3c0 mm/slub.c:2070 ___slab_alloc+0x979/0x1500 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x131/0x310 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc_node+0x4c/0x90 mm/slab_common.c:1014 kmalloc_array_node include/linux/slab.h:698 [inline] kcalloc_node include/linux/slab.h:703 [inline] memcg_alloc_slab_cgroups+0xa9/0x180 mm/memcontrol.c:2968 account_slab mm/slab.h:637 [inline] allocate_slab mm/slub.c:2035 [inline] new_slab+0x2fd/0x3c0 mm/slub.c:2070 ___slab_alloc+0x979/0x1500 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x2dc/0x2f0 mm/slub.c:3502 anon_vma_alloc mm/rmap.c:94 [inline] anon_vma_fork+0xe2/0x610 mm/rmap.c:361 dup_mmap+0x1296/0x1d90 kernel/fork.c:727 dup_mm kernel/fork.c:1691 [inline] copy_mm kernel/fork.c:1740 [inline] copy_process+0x43c8/0x73f0 kernel/fork.c:2502 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1144 [inline] free_unref_page_prepare+0x53c/0xb80 mm/page_alloc.c:2354 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2494 vfree+0x181/0x7a0 mm/vmalloc.c:2842 bpf_check+0x197f/0xa370 kernel/bpf/verifier.c:20718 bpf_prog_load+0x1534/0x2200 kernel/bpf/syscall.c:2717 __sys_bpf+0xbf7/0x4920 kernel/bpf/syscall.c:5384 __do_sys_bpf kernel/bpf/syscall.c:5488 [inline] __se_sys_bpf kernel/bpf/syscall.c:5486 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5486 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff888027bb0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc ffff888027bb0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888027bb0500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027bb0580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027bb0600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================