kobject: kobject_add_internal failed for hci5:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci5: failed to register connection device ================================================================== BUG: KASAN: slab-use-after-free in l2cap_sock_new_connection_cb+0x1f8/0x2b0 net/bluetooth/l2cap_sock.c:1483 Read of size 8 at addr ffff88814c0c0580 by task kworker/u9:1/4613 CPU: 1 UID: 0 PID: 4613 Comm: kworker/u9:1 Not tainted 6.12.0-rc3-syzkaller-00013-geca631b8fe80 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: hci5 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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 l2cap_sock_new_connection_cb+0x1f8/0x2b0 net/bluetooth/l2cap_sock.c:1483 l2cap_connect_cfm+0x377/0x1220 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm+0xa2/0x150 include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5784 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7495 hci_rx_work+0x3fe/0xd80 net/bluetooth/hci_core.c:4025 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 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 4613: 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:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2164 sk_alloc+0x38/0x370 net/core/sock.c:2217 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1877 [inline] l2cap_sock_new_connection_cb+0xe1/0x2b0 net/bluetooth/l2cap_sock.c:1468 l2cap_connect_cfm+0x377/0x1220 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm+0xa2/0x150 include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xd3e/0x12e0 net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x18c/0x420 net/bluetooth/hci_event.c:5784 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0xa55/0x1540 net/bluetooth/hci_event.c:7495 hci_rx_work+0x3fe/0xd80 net/bluetooth/hci_core.c:4025 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 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 10977: 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 mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x1a0/0x440 mm/slub.c:4727 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2292 l2cap_sock_cleanup_listen+0xdd/0x3c0 net/bluetooth/l2cap_sock.c:1448 l2cap_sock_release+0x5d/0x1d0 net/bluetooth/l2cap_sock.c:1411 __sock_release net/socket.c:658 [inline] sock_close+0xbc/0x240 net/socket.c:1426 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:228 get_signal+0x15e8/0x1740 kernel/signal.c:2690 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88814c0c0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1408 bytes inside of freed 2048-byte region [ffff88814c0c0000, ffff88814c0c0800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14c0c0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000040 ffff88801ac42000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 057ff00000000040 ffff88801ac42000 0000000000000000 dead000000000001 head: 0000000000000000 0000000080080008 00000001f5000000 0000000000000000 head: 057ff00000000003 ffffea0005303001 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 1, tgid 1 (swapper/0), ts 17119186413, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3039/0x3180 mm/page_alloc.c:3457 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2412 allocate_slab+0x5a/0x2f0 mm/slub.c:2578 new_slab mm/slub.c:2631 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 __slab_alloc+0x58/0xa0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4283 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:609 pskb_expand_head+0x1f0/0x1380 net/core/skbuff.c:2275 netlink_trim+0x183/0x220 net/netlink/af_netlink.c:1313 netlink_broadcast_filtered+0x76/0x12a0 net/netlink/af_netlink.c:1519 nlmsg_multicast_filtered include/net/netlink.h:1125 [inline] nlmsg_multicast include/net/netlink.h:1144 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2594 register_netdevice+0x1774/0x1b00 net/core/dev.c:10538 register_netdev+0x3b/0x50 net/core/dev.c:10628 page_owner free stack trace missing Memory state around the buggy address: ffff88814c0c0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814c0c0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88814c0c0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88814c0c0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814c0c0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================