================================================================== 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 ffff88802034d080 by task kworker/0:13/8530 CPU: 0 PID: 8530 Comm: kworker/0:13 Not tainted 5.18.0-rc5-syzkaller-00207-g379c72654524 #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 12922: 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 __netlink_create+0x68/0x220 net/netlink/af_netlink.c:647 __netlink_kernel_create+0x1cf/0x7b0 net/netlink/af_netlink.c:2047 netlink_kernel_create include/linux/netlink.h:62 [inline] nl_fib_lookup_init net/ipv4/fib_frontend.c:1403 [inline] fib_net_init+0x1b9/0x350 net/ipv4/fib_frontend.c:1604 ops_init+0x313/0x430 net/core/net_namespace.c:134 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57f/0xb30 kernel/fork.c:3132 __do_sys_unshare kernel/fork.c:3203 [inline] __se_sys_unshare kernel/fork.c:3201 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3201 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 Freed by task 21: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xc6/0x210 mm/slub.c:4552 sk_prot_free net/core/sock.c:1972 [inline] __sk_destruct+0x497/0x5e0 net/core/sock.c:2058 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0xa0c/0x16d0 kernel/rcu/tree.c:2786 __do_softirq+0x382/0x793 kernel/softirq.c:558 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 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_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 The buggy address belongs to the object at ffff88802034d000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff88802034d000, ffff88802034d800) The buggy address belongs to the physical page: page:ffffea000080d200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20348 head:ffffea000080d200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888011442000 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3607, tgid 3607 (syz-executor.0), ts 55035351671, free_ts 55017370021 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:2546 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 __netdev_upper_dev_link+0xbe4/0xea0 net/core/dev.c:7545 netdev_upper_dev_link+0x9a/0xe0 net/core/dev.c:7586 hsr_portdev_setup net/hsr/hsr_slave.c:141 [inline] hsr_add_port+0x49e/0x640 net/hsr/hsr_slave.c:184 hsr_dev_finalize+0x4ff/0x760 net/hsr/hsr_device.c:545 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 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] slab_alloc mm/slub.c:3225 [inline] kmem_cache_alloc_trace+0x1db/0x310 mm/slub.c:3256 kmalloc include/linux/slab.h:581 [inline] kmalloc_array include/linux/slab.h:620 [inline] rtnl_newlink+0x10b/0x2070 net/core/rtnetlink.c:3527 rtnetlink_rcv_msg+0x92f/0xe80 net/core/rtnetlink.c:5993 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2503 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 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: ffff88802034cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802034d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802034d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802034d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802034d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================