================================================================== 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+0xad/0x210 net/bluetooth/sco.c:107 Write of size 8 at addr ffff888021a9d5a0 by task syz-executor/5846 CPU: 0 UID: 0 PID: 5846 Comm: syz-executor Not tainted 6.13.0-syzkaller-04117-g9e6c4e6b605c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 sco_conn_free net/bluetooth/sco.c:87 [inline] kref_put include/linux/kref.h:65 [inline] sco_conn_put+0xad/0x210 net/bluetooth/sco.c:107 hci_disconn_cfm include/net/bluetooth/hci_core.h:2069 [inline] hci_conn_hash_flush+0x1be/0x350 net/bluetooth/hci_conn.c:2698 hci_dev_close_sync+0xa42/0x11c0 net/bluetooth/hci_sync.c:5197 hci_dev_do_close net/bluetooth/hci_core.c:482 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2677 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x23c/0xa50 fs/file_table.c:450 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 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 RIP: 0033:0x7fec0d98cda9 Code: Unable to access opcode bytes at 0x7fec0d98cd7f. RSP: 002b:00007ffca34b0108 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fec0d98cda9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043 RBP: 00007fec0d9eaad8 R08: 00007ffca34adea7 R09: 00000000000927c0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 0000000000000000 R15: 00007ffca34b09a0 Allocated by task 7091: 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:260 [inline] __do_kmalloc_node mm/slub.c:4298 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4310 kmalloc_noprof include/linux/slab.h:905 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2181 sk_alloc+0x38/0x370 net/core/sock.c:2234 __netlink_create+0x65/0x260 net/netlink/af_netlink.c:629 netlink_create+0x3ab/0x560 net/netlink/af_netlink.c:687 __sock_create+0x4c0/0xa30 net/socket.c:1543 sock_create net/socket.c:1601 [inline] __sys_socket_create net/socket.c:1638 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1685 __do_sys_socket net/socket.c:1699 [inline] __se_sys_socket net/socket.c:1697 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1697 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 Freed by task 7086: 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:582 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:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x196/0x430 mm/slub.c:4761 sk_prot_free net/core/sock.c:2217 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2309 rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 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:544 __call_rcu_common kernel/rcu/tree.c:3065 [inline] call_rcu+0x168/0xac0 kernel/rcu/tree.c:3172 netlink_release+0x16f7/0x1bf0 net/netlink/af_netlink.c:808 __sock_release net/socket.c:642 [inline] sock_close+0xbc/0x240 net/socket.c:1393 __fput+0x23c/0xa50 fs/file_table.c:450 task_work_run+0x24f/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16b2/0x1750 kernel/signal.c:3036 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:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 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 ffff888021a9d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1440 bytes inside of freed 2048-byte region [ffff888021a9d000, ffff888021a9d800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888021a9a000 pfn:0x21a98 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801ac42000 ffffea000086a210 ffffea00017d1210 raw: ffff888021a9a000 0000000000080002 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801ac42000 ffffea000086a210 ffffea00017d1210 head: ffff888021a9a000 0000000000080002 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea000086a601 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 1, tgid 1 (swapper/0), ts 3435334248, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3476 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4753 alloc_pages_mpol_noprof+0x3e1/0x780 mm/mempolicy.c:2269 alloc_slab_page+0x6a/0x110 mm/slub.c:2423 allocate_slab+0x5a/0x2b0 mm/slub.c:2589 new_slab mm/slub.c:2642 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830 __slab_alloc+0x58/0xa0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __kmalloc_cache_noprof+0x27b/0x390 mm/slub.c:4324 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] acpi_add_single_object+0xe5/0x1e00 drivers/acpi/scan.c:1876 acpi_bus_check_add+0x32b/0x980 drivers/acpi/scan.c:2181 acpi_ns_walk_namespace+0x294/0x4f0 acpi_walk_namespace+0xeb/0x130 drivers/acpi/acpica/nsxfeval.c:606 acpi_bus_scan+0x4c1/0x560 drivers/acpi/scan.c:2595 acpi_scan_init+0x267/0x730 drivers/acpi/scan.c:2747 acpi_init+0x15e/0x240 drivers/acpi/bus.c:1467 page_owner free stack trace missing Memory state around the buggy address: ffff888021a9d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888021a9d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888021a9d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888021a9d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888021a9d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================