Bluetooth: Wrong link type (-22) Bluetooth: Unknown BR/EDR signaling command 0x0d Bluetooth: Wrong link type (-22) Bluetooth: Unknown BR/EDR signaling command 0x0d Bluetooth: Wrong link type (-22) Bluetooth: Unknown BR/EDR signaling command 0x0f Bluetooth: Wrong link type (-22) ================================================================== BUG: KASAN: slab-use-after-free in l2cap_build_cmd net/bluetooth/l2cap_core.c:2951 [inline] BUG: KASAN: slab-use-after-free in l2cap_send_cmd+0x67b/0x8d0 net/bluetooth/l2cap_core.c:954 Read of size 4 at addr ffff888027af1810 by task kworker/u9:1/11194 CPU: 0 UID: 0 PID: 11194 Comm: kworker/u9:1 Not tainted 6.10.0-next-20240724-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: hci4 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_build_cmd net/bluetooth/l2cap_core.c:2951 [inline] l2cap_send_cmd+0x67b/0x8d0 net/bluetooth/l2cap_core.c:954 l2cap_sig_send_rej net/bluetooth/l2cap_core.c:5510 [inline] l2cap_sig_channel net/bluetooth/l2cap_core.c:5546 [inline] l2cap_recv_frame+0x22f1/0x10840 net/bluetooth/l2cap_core.c:6824 hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline] hci_rx_work+0x50f/0xca0 net/bluetooth/hci_core.c:4034 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 54: 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_cache_noprof+0x19c/0x2c0 mm/slub.c:4189 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] l2cap_conn_add+0xa9/0x8e0 net/bluetooth/l2cap_core.c:6867 l2cap_connect_cfm+0x136/0x1220 net/bluetooth/l2cap_core.c:7244 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline] hci_remote_features_evt+0x536/0xaf0 net/bluetooth/hci_event.c:3720 hci_event_func net/bluetooth/hci_event.c:7445 [inline] hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7497 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 54: 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+0xe0/0x150 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:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 l2cap_connect_cfm+0x11f/0x1220 net/bluetooth/l2cap_core.c:7240 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline] hci_conn_failed+0x1f6/0x340 net/bluetooth/hci_conn.c:1265 hci_abort_conn_sync+0x583/0xde0 net/bluetooth/hci_sync.c:5531 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:328 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2185 __queue_work+0xc8b/0xf50 kernel/workqueue.c:2341 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1838 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x695/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x312/0x3b0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x365/0x610 net/batman-adv/network-coding.c:722 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Second to last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 insert_work+0x3e/0x330 kernel/workqueue.c:2185 __queue_work+0xb66/0xf50 kernel/workqueue.c:2345 queue_work_on+0x1c2/0x380 kernel/workqueue.c:2392 queue_work include/linux/workqueue.h:621 [inline] l2cap_conn_ready net/bluetooth/l2cap_core.c:1640 [inline] l2cap_connect_cfm+0xec2/0x1220 net/bluetooth/l2cap_core.c:7285 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline] hci_remote_features_evt+0x536/0xaf0 net/bluetooth/hci_event.c:3720 hci_event_func net/bluetooth/hci_event.c:7445 [inline] hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7497 hci_rx_work+0x3e8/0xca0 net/bluetooth/hci_core.c:4029 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888027af1800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 16 bytes inside of freed 1024-byte region [ffff888027af1800, ffff888027af1c00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27af0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015041dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015041dc0 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea00009ebc01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5097, tgid 5097 (syz-executor), ts 62038554166, free_ts 62022694373 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3438 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_noprof+0x286/0x440 mm/slub.c:4164 kmalloc_node_noprof include/linux/slab.h:708 [inline] qdisc_alloc+0x97/0xa80 net/sched/sch_generic.c:946 qdisc_create_dflt+0x62/0x4b0 net/sched/sch_generic.c:1008 attach_one_default_qdisc net/sched/sch_generic.c:1174 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2513 [inline] attach_default_qdiscs net/sched/sch_generic.c:1192 [inline] dev_activate+0x3c0/0x1240 net/sched/sch_generic.c:1251 __dev_open+0x352/0x450 net/core/dev.c:1483 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:8837 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8909 do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:2987 __rtnl_newlink net/core/rtnetlink.c:3783 [inline] rtnl_newlink+0x17a9/0x2070 net/core/rtnetlink.c:3830 page last free pid 5114 tgid 5114 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2608 discard_slab mm/slub.c:2583 [inline] __put_partials+0xeb/0x130 mm/slub.c:3051 put_cpu_partial+0x17c/0x250 mm/slub.c:3126 __slab_free+0x2ea/0x3d0 mm/slub.c:4343 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 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:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:664 netlink_sendmsg+0x638/0xcb0 net/netlink/af_netlink.c:1876 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888027af1700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027af1780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888027af1800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027af1880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027af1900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================