================================================================== BUG: KASAN: slab-use-after-free in sco_conn_free net/bluetooth/sco.c:87 [inline] BUG: KASAN: slab-use-after-free in kref_put include/linux/kref.h:65 [inline] BUG: KASAN: slab-use-after-free in sco_conn_put+0x471/0x4c0 net/bluetooth/sco.c:107 Write of size 8 at addr ffff88804262d5a0 by task syz.4.372/7550 CPU: 0 UID: 0 PID: 7550 Comm: syz.4.372 Not tainted 6.14.0-rc6-syzkaller-00016-g0fed89a961ea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xd9/0x110 mm/kasan/report.c:634 sco_conn_free net/bluetooth/sco.c:87 [inline] kref_put include/linux/kref.h:65 [inline] sco_conn_put+0x471/0x4c0 net/bluetooth/sco.c:107 sco_conn_del+0x26f/0x2e0 net/bluetooth/sco.c:263 sco_connect_cfm+0x1d4/0xc00 net/bluetooth/sco.c:1417 hci_connect_cfm include/net/bluetooth/hci_core.h:2051 [inline] hci_conn_failed+0x225/0x3e0 net/bluetooth/hci_conn.c:1266 hci_conn_cleanup_child net/bluetooth/hci_conn.c:1076 [inline] hci_conn_unlink+0x71e/0x9f0 net/bluetooth/hci_conn.c:1103 hci_conn_del+0x61/0xdb0 net/bluetooth/hci_conn.c:1129 hci_conn_failed+0x2a6/0x3e0 net/bluetooth/hci_conn.c:1267 hci_abort_conn_sync+0x91c/0xfe0 net/bluetooth/hci_sync.c:5588 hci_disconnect_all_sync.constprop.0+0x104/0x3c0 net/bluetooth/hci_sync.c:5611 hci_suspend_sync+0x772/0xab0 net/bluetooth/hci_sync.c:6088 hci_suspend_dev+0x30a/0x510 net/bluetooth/hci_core.c:2811 hci_suspend_notifier+0x28d/0x2f0 net/bluetooth/hci_core.c:2391 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:345 [inline] blocking_notifier_call_chain_robust+0xc9/0x170 kernel/notifier.c:333 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:102 snapshot_open+0x189/0x2b0 kernel/power/user.c:77 misc_open+0x35a/0x420 drivers/char/misc.c:179 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x735/0x1c40 fs/open.c:956 vfs_open+0x82/0x3f0 fs/open.c:1086 do_open fs/namei.c:3830 [inline] path_openat+0x1e88/0x2d80 fs/namei.c:3989 do_filp_open+0x20c/0x470 fs/namei.c:4016 do_sys_openat2+0x17a/0x1e0 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1454 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 RIP: 0033:0x7f30a358d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f30a430f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f30a37a5fa0 RCX: 00007f30a358d169 RDX: 0000000000000080 RSI: 00004000000006c0 RDI: ffffffffffffff9c RBP: 00007f30a360e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f30a37a5fa0 R15: 00007ffd90085b38 Allocated by task 7405: 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:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x21c/0x510 mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] sk_prot_alloc+0x1a8/0x2a0 net/core/sock.c:2181 sk_alloc+0x36/0xc20 net/core/sock.c:2234 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:552 [inline] sco_sock_create+0xe3/0x3c0 net/bluetooth/sco.c:583 bt_sock_create+0x182/0x350 net/bluetooth/af_bluetooth.c:132 __sock_create+0x335/0x8d0 net/socket.c:1548 sock_create net/socket.c:1606 [inline] __sys_socket_create net/socket.c:1643 [inline] __sys_socket+0x14f/0x260 net/socket.c:1690 __do_sys_socket net/socket.c:1704 [inline] __se_sys_socket net/socket.c:1702 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1702 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 Freed by task 7404: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x2c4/0x4d0 mm/slub.c:4757 sk_prot_free net/core/sock.c:2217 [inline] __sk_destruct+0x5ef/0x6f0 net/core/sock.c:2312 sk_destruct+0xc2/0xf0 net/core/sock.c:2340 __sk_free+0xf4/0x3e0 net/core/sock.c:2351 sk_free+0x6a/0x90 net/core/sock.c:2362 sock_put include/net/sock.h:1914 [inline] sco_sock_kill net/bluetooth/sco.c:494 [inline] sco_sock_kill+0x11a/0x1c0 net/bluetooth/sco.c:484 sco_sock_release+0x154/0x2d0 net/bluetooth/sco.c:1310 __sock_release+0xb0/0x270 net/socket.c:647 sock_close+0x1c/0x30 net/socket.c:1398 __fput+0x3ff/0xb70 fs/file_table.c:464 task_work_run+0x14e/0x250 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xad8/0x2d70 kernel/exit.c:938 do_group_exit+0xd3/0x2a0 kernel/exit.c:1087 get_signal+0x24ed/0x26c0 kernel/signal.c:3036 arch_do_signal_or_restart+0x90/0x7e0 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88804262d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1440 bytes inside of freed 2048-byte region [ffff88804262d000, ffff88804262d800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42628 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: f5(slab) raw: 00fff00000000040 ffff88801b042000 ffffea00010b0400 dead000000000002 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042000 ffffea00010b0400 dead000000000002 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001098a01 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 5870, tgid 5870 (kworker/1:4), ts 59345836896, free_ts 59296138958 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x181/0x1b0 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x221/0x2470 mm/page_alloc.c:4740 alloc_pages_mpol+0x1fc/0x540 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2587 [inline] new_slab+0x23d/0x330 mm/slub.c:2640 ___slab_alloc+0xc5d/0x1720 mm/slub.c:3826 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_node_track_caller_noprof+0x2f1/0x510 mm/slub.c:4313 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:537 __alloc_skb+0x164/0x380 net/core/skbuff.c:606 alloc_skb include/linux/skbuff.h:1331 [inline] mld_newpack.isra.0+0x18f/0xa20 net/ipv6/mcast.c:1788 add_grhead+0x299/0x340 net/ipv6/mcast.c:1899 add_grec+0x111e/0x1670 net/ipv6/mcast.c:2037 mld_send_cr net/ipv6/mcast.c:2163 [inline] mld_ifc_work+0x41f/0xca0 net/ipv6/mcast.c:2702 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400 page last free pid 5816 tgid 5816 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x6db/0xfb0 mm/page_alloc.c:2660 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_lru_noprof+0x226/0x3d0 mm/slub.c:4183 __d_alloc+0x31/0xaa0 fs/dcache.c:1664 d_alloc+0x4a/0x1e0 fs/dcache.c:1743 d_alloc_parallel+0xe7/0x12b0 fs/dcache.c:2507 __lookup_slow+0x194/0x470 fs/namei.c:1778 lookup_one_len+0x181/0x1b0 fs/namei.c:2907 start_creating.part.0+0x12f/0x3a0 fs/debugfs/inode.c:391 start_creating fs/debugfs/inode.c:364 [inline] __debugfs_create_file+0xa5/0x6b0 fs/debugfs/inode.c:437 debugfs_create_file_short+0x41/0x60 fs/debugfs/inode.c:485 debugfs_hw_add+0x149/0x3a0 net/mac80211/debugfs.c:650 ieee80211_register_hw+0x2475/0x4060 net/mac80211/main.c:1591 mac80211_hwsim_new_radio+0x304e/0x54e0 drivers/net/wireless/virtual/mac80211_hwsim.c:5558 Memory state around the buggy address: ffff88804262d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804262d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804262d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804262d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804262d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================