================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: use-after-free in sock_hold include/net/sock.h:726 [inline] BUG: KASAN: use-after-free in sco_sock_timeout+0x63/0x240 net/bluetooth/sco.c:89 Write of size 4 at addr ffff888077ac4080 by task kworker/1:17/4040 CPU: 1 PID: 4040 Comm: kworker/1:17 Not tainted 5.18.0-rc6-syzkaller-00085-gf3f19f939c11 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events sco_sock_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:116 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:726 [inline] sco_sock_timeout+0x63/0x240 net/bluetooth/sco.c:89 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Allocated by task 10436: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x223/0x370 mm/slub.c:4414 kmalloc include/linux/slab.h:586 [inline] sk_prot_alloc+0xde/0x200 net/core/sock.c:1936 sk_alloc+0x36/0x340 net/core/sock.c:1989 sco_sock_alloc net/bluetooth/sco.c:483 [inline] sco_sock_create+0xb0/0x450 net/bluetooth/sco.c:522 bt_sock_create+0x15b/0x220 net/bluetooth/af_bluetooth.c:130 __sock_create+0x3fd/0x850 net/socket.c:1468 sock_create net/socket.c:1519 [inline] __sys_socket+0x133/0x370 net/socket.c:1561 __do_sys_socket net/socket.c:1570 [inline] __se_sys_socket net/socket.c:1568 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:3074 netlink_release+0x1310/0x1730 net/netlink/af_netlink.c:815 __sock_release net/socket.c:650 [inline] sock_close+0xd7/0x260 net/socket.c:1318 __fput+0x3b9/0x820 fs/file_table.c:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:3074 netlink_release+0x1310/0x1730 net/netlink/af_netlink.c:815 __sock_release net/socket.c:650 [inline] sock_release+0x7a/0x140 net/socket.c:678 nl_fib_lookup_exit net/ipv4/fib_frontend.c:1412 [inline] fib_net_exit+0x44/0x60 net/ipv4/fib_frontend.c:1625 ops_exit_list net/core/net_namespace.c:162 [inline] cleanup_net+0x758/0xc50 net/core/net_namespace.c:594 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff888077ac4000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff888077ac4000, ffff888077ac4800) The buggy address belongs to the physical page: page:ffffea0001deb000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077ac0000 pfn:0x77ac0 head:ffffea0001deb000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f18808 ffffea000168ce08 ffff888011442000 raw: ffff888077ac0000 0000000000080003 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3616, tgid 3616 (syz-executor.3), ts 57768961763, free_ts 57767948621 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x72e/0x7a0 mm/page_alloc.c:4182 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5408 alloc_slab_page+0x70/0xf0 mm/slub.c:1799 allocate_slab+0x5e/0x560 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3005 __slab_alloc mm/slub.c:3092 [inline] slab_alloc_node mm/slub.c:3183 [inline] __kmalloc_node_track_caller+0x2bb/0x3f0 mm/slub.c:4947 kmalloc_reserve net/core/skbuff.c:354 [inline] pskb_expand_head+0x11f/0x1220 net/core/skbuff.c:1700 netlink_trim+0x17f/0x210 net/netlink/af_netlink.c:1301 netlink_broadcast+0x64/0x1170 net/netlink/af_netlink.c:1497 nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0xfa/0x1c0 net/netlink/af_netlink.c:2545 rtnl_notify net/core/rtnetlink.c:730 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3868 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3883 [inline] rtnetlink_event+0x151/0x1b0 net/core/rtnetlink.c:6044 notifier_call_chain kernel/notifier.c:84 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:392 call_netdevice_notifiers_info net/core/dev.c:1938 [inline] call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers net/core/dev.c:1990 [inline] dev_set_mac_address+0x31d/0x470 net/core/dev.c:8694 dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:8708 do_setlink+0x90d/0x3ce0 net/core/rtnetlink.c:2686 __rtnl_newlink net/core/rtnetlink.c:3416 [inline] rtnl_newlink+0x1798/0x2070 net/core/rtnetlink.c:3531 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x7d/0x390 mm/page_alloc.c:3423 free_slab mm/slub.c:2043 [inline] discard_slab mm/slub.c:2049 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2523 put_cpu_partial+0x116/0x180 mm/slub.c:2599 do_slab_free mm/slub.c:3498 [inline] ___cache_free+0x118/0x1a0 mm/slub.c:3517 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] kmem_cache_alloc_node+0x1cd/0x340 mm/slub.c:3267 __alloc_skb+0xd2/0x590 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1300 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline] netlink_sendmsg+0x774/0xcd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] __sys_sendto+0x42e/0x5b0 net/socket.c:2040 __do_sys_sendto net/socket.c:2052 [inline] __se_sys_sendto net/socket.c:2048 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2048 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff888077ac3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077ac4000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888077ac4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077ac4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077ac4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================