================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] BUG: KASAN: slab-use-after-free in __refcount_add include/linux/refcount.h:182 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:239 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:256 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:760 [inline] BUG: KASAN: slab-use-after-free in sco_conn_del+0xb9/0x2d0 net/bluetooth/sco.c:195 Write of size 4 at addr ffff88804ebbd080 by task syz-executor.0/8176 CPU: 0 PID: 8176 Comm: syz-executor.0 Not tainted 6.8.0-rc1-syzkaller-00454-gbeb53f32698f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x190 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:252 [inline] __refcount_add include/linux/refcount.h:182 [inline] __refcount_inc include/linux/refcount.h:239 [inline] refcount_inc include/linux/refcount.h:256 [inline] sock_hold include/net/sock.h:760 [inline] sco_conn_del+0xb9/0x2d0 net/bluetooth/sco.c:195 sco_disconn_cfm+0x76/0xb0 net/bluetooth/sco.c:1371 hci_disconn_cfm include/net/bluetooth/hci_core.h:2001 [inline] hci_conn_hash_flush+0x114/0x260 net/bluetooth/hci_conn.c:2645 hci_dev_close_sync+0x59b/0x1150 net/bluetooth/hci_sync.c:4954 hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:554 hci_unregister_dev+0x1eb/0x600 net/bluetooth/hci_core.c:2739 vhci_release+0x7f/0x100 drivers/bluetooth/hci_vhci.c:674 __fput+0x270/0xb70 fs/file_table.c:376 task_work_run+0x14d/0x240 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa8a/0x2ad0 kernel/exit.c:871 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020 get_signal+0x23b5/0x2790 kernel/signal.c:2893 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fd81c67ba4c Code: Unable to access opcode bytes at 0x7fd81c67ba22. RSP: 002b:00007fffb2fd11e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007fd81c67ba4c RDX: 0000000000000040 RSI: 00007fd81c7a8020 RDI: 00000000000000f9 RBP: 00007fffb2fd126c R08: 0000000000000000 R09: 0079746972756365 R10: 00007fd81c77b6a0 R11: 0000000000000246 R12: 0000000000000032 R13: 0000000000066fbc R14: 0000000000066f75 R15: 0000000000000005 Allocated by task 8317: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc+0x1f9/0x440 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] sk_prot_alloc+0x1a4/0x2a0 net/core/sock.c:2079 sk_alloc+0x36/0xb80 net/core/sock.c:2132 bt_sock_alloc+0x3b/0x3a0 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:495 [inline] sco_sock_create+0xe3/0x3b0 net/bluetooth/sco.c:526 bt_sock_create+0x180/0x340 net/bluetooth/af_bluetooth.c:132 __sock_create+0x328/0x800 net/socket.c:1571 sock_create net/socket.c:1622 [inline] __sys_socket_create net/socket.c:1659 [inline] __sys_socket+0x14c/0x260 net/socket.c:1706 __do_sys_socket net/socket.c:1720 [inline] __se_sys_socket net/socket.c:1718 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1718 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 8316: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x360 mm/slub.c:4409 sk_prot_free net/core/sock.c:2115 [inline] __sk_destruct+0x5e1/0x740 net/core/sock.c:2207 sk_destruct+0xc2/0xf0 net/core/sock.c:2222 __sk_free+0xf4/0x3e0 net/core/sock.c:2233 sk_free+0x7c/0xa0 net/core/sock.c:2244 sock_put include/net/sock.h:1961 [inline] sco_sock_kill net/bluetooth/sco.c:426 [inline] sco_sock_kill+0x19d/0x1c0 net/bluetooth/sco.c:416 sco_sock_release+0x154/0x2c0 net/bluetooth/sco.c:1256 __sock_release+0xae/0x260 net/socket.c:659 sock_close+0x1c/0x20 net/socket.c:1421 __fput+0x270/0xb70 fs/file_table.c:376 task_work_run+0x14d/0x240 kernel/task_work.c:180 get_signal+0x106f/0x2790 kernel/signal.c:2669 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline] syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b The buggy address belongs to the object at ffff88804ebbd000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff88804ebbd000, ffff88804ebbd800) The buggy address belongs to the physical page: page:ffffea00013aee00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ebb8 head:ffffea00013aee00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888013042000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000001ffffffff 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 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5133, tgid 5133 (syz-executor.0), ts 98216180699, free_ts 20144151728 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x35b/0x460 mm/slub.c:4001 kmalloc_reserve+0xef/0x260 net/core/skbuff.c:582 pskb_expand_head+0x236/0x1170 net/core/skbuff.c:2136 netlink_trim+0x1eb/0x250 net/netlink/af_netlink.c:1323 netlink_broadcast_filtered+0xca/0xf20 net/netlink/af_netlink.c:1529 nlmsg_multicast_filtered include/net/netlink.h:1111 [inline] nlmsg_multicast include/net/netlink.h:1130 [inline] nlmsg_notify+0x9e/0x220 net/netlink/af_netlink.c:2586 rtnl_notify net/core/rtnetlink.c:766 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:4099 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4115 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4102 [inline] rtnetlink_event+0x173/0x1f0 net/core/rtnetlink.c:6666 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x130 net/core/dev.c:1966 call_netdevice_notifiers_extack net/core/dev.c:2004 [inline] call_netdevice_notifiers+0x7d/0xb0 net/core/dev.c:2018 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x51f/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 free_contig_range+0xb6/0x190 mm/page_alloc.c:6535 destroy_args+0xa69/0xe40 mm/debug_vm_pgtable.c:1028 debug_vm_pgtable+0x16fe/0x3250 mm/debug_vm_pgtable.c:1408 do_one_initcall+0x11c/0x650 init/main.c:1236 do_initcall_level init/main.c:1298 [inline] do_initcalls init/main.c:1314 [inline] do_basic_setup init/main.c:1333 [inline] kernel_init_freeable+0x687/0xc10 init/main.c:1551 kernel_init+0x1c/0x2a0 init/main.c:1441 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Memory state around the buggy address: ffff88804ebbcf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804ebbd000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804ebbd080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804ebbd100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804ebbd180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================