================================================================== 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 ffff888022ee2080 by task syz-executor/9937 CPU: 1 UID: 0 PID: 9937 Comm: syz-executor Not tainted 6.11.0-syzkaller-01466-gc8770db2d544 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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:2589 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+0x83/0xd0 drivers/bluetooth/hci_vhci.c:664 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 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: 0033:0x7fac36d7def9 Code: Unable to access opcode bytes at 0x7fac36d7decf. RSP: 002b:00007fff56fbbb08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fac36d7def9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043 RBP: 00007fac36ddd508 R08: 00007fff56fb98a7 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000003 R14: 00000000ffffffff R15: 00007fff56fbbcb0 Allocated by task 10094: 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] __do_kmalloc_node mm/slub.c:4162 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4174 kmalloc_noprof include/linux/slab.h:685 [inline] sk_prot_alloc+0xe0/0x210 net/core/sock.c:2164 sk_alloc+0x38/0x370 net/core/sock.c:2217 bt_sock_alloc+0x3c/0x340 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:500 [inline] sco_sock_create+0xbb/0x390 net/bluetooth/sco.c:531 bt_sock_create+0x161/0x230 net/bluetooth/af_bluetooth.c:132 __sock_create+0x490/0x920 net/socket.c:1577 sock_create net/socket.c:1628 [inline] __sys_socket_create net/socket.c:1665 [inline] __sys_socket+0x150/0x3c0 net/socket.c:1712 __do_sys_socket net/socket.c:1726 [inline] __se_sys_socket net/socket.c:1724 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1724 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 10092: 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:2256 [inline] slab_free mm/slub.c:4477 [inline] kfree+0x149/0x360 mm/slub.c:4598 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x479/0x5f0 net/core/sock.c:2292 sco_sock_release+0x25e/0x320 net/bluetooth/sco.c:1259 __sock_release net/socket.c:659 [inline] sock_close+0xbc/0x240 net/socket.c:1427 __fput+0x24a/0x8a0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 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 The buggy address belongs to the object at ffff888022ee2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of freed 2048-byte region [ffff888022ee2000, ffff888022ee2800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22ee0 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 ffff88801ac42000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff88801ac42000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea00008bb801 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5233, tgid 5233 (syz-executor), ts 84599184041, free_ts 84591721256 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702 __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:2325 allocate_slab+0x5a/0x2f0 mm/slub.c:2488 new_slab mm/slub.c:2541 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3727 __slab_alloc+0x58/0xa0 mm/slub.c:3817 __slab_alloc_node mm/slub.c:3870 [inline] slab_alloc_node mm/slub.c:4029 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4188 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] psi_cgroup_alloc+0x56/0x210 kernel/sched/psi.c:1108 cgroup_create kernel/cgroup/cgroup.c:5642 [inline] cgroup_mkdir+0x503/0xd30 kernel/cgroup/cgroup.c:5762 kernfs_iop_mkdir+0x253/0x3f0 fs/kernfs/dir.c:1246 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4210 do_mkdirat+0x264/0x3a0 fs/namei.c:4233 __do_sys_mkdirat fs/namei.c:4248 [inline] __se_sys_mkdirat fs/namei.c:4246 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4246 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 page last free pid 5239 tgid 5239 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2619 discard_slab mm/slub.c:2587 [inline] __put_partials+0xeb/0x130 mm/slub.c:3055 put_cpu_partial+0x17c/0x250 mm/slub.c:3130 __slab_free+0x2ea/0x3d0 mm/slub.c:4347 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:3992 [inline] slab_alloc_node mm/slub.c:4041 [inline] __kmalloc_cache_noprof+0x132/0x2c0 mm/slub.c:4188 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] ref_tracker_alloc+0x14b/0x490 lib/ref_tracker.c:203 __netdev_tracker_alloc include/linux/netdevice.h:4050 [inline] netdev_tracker_alloc include/linux/netdevice.h:4062 [inline] netdev_get_by_index+0x7a/0xb0 net/core/dev.c:916 fib6_nh_init+0x1d8/0x2180 net/ipv6/route.c:3543 ip6_route_info_create+0x999/0x12b0 net/ipv6/route.c:3809 ip6_route_add+0x28/0x160 net/ipv6/route.c:3853 addrconf_prefix_route+0x314/0x4e0 net/ipv6/addrconf.c:2486 inet6_addr_add+0x627/0xb00 net/ipv6/addrconf.c:3065 inet6_rtm_newaddr+0x8a3/0xc90 net/ipv6/addrconf.c:5050 Memory state around the buggy address: ffff888022ee1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888022ee2000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022ee2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022ee2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022ee2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================