================================================================== 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:184 [inline] BUG: KASAN: slab-use-after-free in __refcount_inc include/linux/refcount.h:241 [inline] BUG: KASAN: slab-use-after-free in refcount_inc include/linux/refcount.h:258 [inline] BUG: KASAN: slab-use-after-free in sock_hold include/net/sock.h:781 [inline] BUG: KASAN: slab-use-after-free in sco_conn_del+0xa5/0x310 net/bluetooth/sco.c:199 Write of size 4 at addr ffff88804dea7080 by task syz-executor/5250 CPU: 0 UID: 0 PID: 5250 Comm: syz-executor Not tainted 6.12.0-rc2-syzkaller-00498-g59ae83dcf102 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 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:184 [inline] __refcount_inc include/linux/refcount.h:241 [inline] refcount_inc include/linux/refcount.h:258 [inline] sock_hold include/net/sock.h:781 [inline] sco_conn_del+0xa5/0x310 net/bluetooth/sco.c:199 hci_disconn_cfm include/net/bluetooth/hci_core.h:1975 [inline] hci_conn_hash_flush+0xff/0x240 net/bluetooth/hci_conn.c:2592 hci_dev_close_sync+0x9ef/0x11a0 net/bluetooth/hci_sync.c:5195 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline] hci_unregister_dev+0x20b/0x510 net/bluetooth/hci_core.c:2698 vhci_release+0x80/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x23f/0x880 fs/file_table.c:431 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 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: 0033:0x7f8bf257dff9 Code: Unable to access opcode bytes at 0x7f8bf257dfcf. RSP: 002b:00007ffff08d8f48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8bf257dff9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043 RBP: 00007f8bf25da950 R08: 00007ffff08d6ce7 R09: 000000000002171b R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000002171b R14: 0000000000000000 R15: 00007ffff08d97d0 Allocated by task 4901: 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:2162 sk_alloc+0x38/0x370 net/core/sock.c:2215 __netlink_create+0x65/0x260 net/netlink/af_netlink.c:646 netlink_create+0x3ab/0x560 net/netlink/af_netlink.c:704 __sock_create+0x490/0x940 net/socket.c:1576 sock_create net/socket.c:1632 [inline] __sys_socket_create net/socket.c:1669 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1716 __do_sys_socket net/socket.c:1730 [inline] __se_sys_socket net/socket.c:1728 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1728 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 0: 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:2198 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2290 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037 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:541 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 netlink_release+0x1638/0x1b10 net/netlink/af_netlink.c:823 __sock_release net/socket.c:658 [inline] sock_close+0xbc/0x240 net/socket.c:1426 __fput+0x23f/0x880 fs/file_table.c:431 __do_sys_close fs/open.c:1565 [inline] __se_sys_close fs/open.c:1550 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1550 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 The buggy address belongs to the object at ffff88804dea7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff88804dea7000, ffff88804dea7800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804dea0000 pfn:0x4dea0 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 ffffea0001f9d810 ffffea0001f68c10 raw: ffff88804dea0000 0000000000080006 00000001f5000000 0000000000000000 head: 00fff00000000240 ffff88801ac42000 ffffea0001f9d810 ffffea0001f68c10 head: ffff88804dea0000 0000000000080006 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea000137a801 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 5245, tgid 5245 (syz-executor), ts 66024572933, free_ts 66006567989 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+0x3045/0x3190 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] __kmalloc_cache_node_noprof+0x20c/0x300 mm/slub.c:4303 kmalloc_node_noprof include/linux/slab.h:901 [inline] page_pool_create_percpu+0x77/0xa00 net/core/page_pool.c:335 nsim_create_page_pool drivers/net/netdevsim/netdev.c:374 [inline] nsim_init_napi drivers/net/netdevsim/netdev.c:399 [inline] nsim_open+0x38c/0x880 drivers/net/netdevsim/netdev.c:436 __dev_open+0x2d3/0x450 net/core/dev.c:1476 __dev_change_flags+0x1e2/0x6f0 net/core/dev.c:8843 dev_change_flags+0x8b/0x1a0 net/core/dev.c:8915 do_setlink+0xcd0/0x41f0 net/core/rtnetlink.c:3003 __rtnl_newlink net/core/rtnetlink.c:3799 [inline] rtnl_newlink+0x180d/0x20a0 net/core/rtnetlink.c:3846 page last free pid 4687 tgid 4687 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2638 discard_slab mm/slub.c:2677 [inline] __put_partials+0xeb/0x130 mm/slub.c:3145 put_cpu_partial+0x17c/0x250 mm/slub.c:3220 __slab_free+0x2ea/0x3d0 mm/slub.c:4449 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/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:329 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_lru_noprof+0x139/0x2b0 mm/slub.c:4153 __d_alloc+0x31/0x700 fs/dcache.c:1636 d_alloc fs/dcache.c:1716 [inline] d_alloc_parallel+0xdf/0x1600 fs/dcache.c:2478 __lookup_slow+0x117/0x3f0 fs/namei.c:1717 lookup_slow+0x53/0x70 fs/namei.c:1749 walk_component fs/namei.c:2053 [inline] link_path_walk+0x99b/0xea0 fs/namei.c:2418 path_openat+0x266/0x3590 fs/namei.c:3929 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415 Memory state around the buggy address: ffff88804dea6f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88804dea7000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804dea7080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804dea7100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804dea7180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================