================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_dec_if_positive include/asm-generic/atomic-instrumented.h:1176 [inline] BUG: KASAN: use-after-free in atomic_long_dec_if_positive include/asm-generic/atomic-long.h:515 [inline] BUG: KASAN: use-after-free in dec_ucount+0x54/0x130 kernel/ucount.c:245 Write of size 8 at addr ffff888080e36540 by task kworker/u4:21/15656 CPU: 0 PID: 15656 Comm: kworker/u4:21 Tainted: G W 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic64_dec_if_positive include/asm-generic/atomic-instrumented.h:1176 [inline] atomic_long_dec_if_positive include/asm-generic/atomic-long.h:515 [inline] dec_ucount+0x54/0x130 kernel/ucount.c:245 dec_net_namespaces net/core/net_namespace.c:394 [inline] cleanup_net+0x6f3/0xb10 net/core/net_namespace.c:611 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 5515: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x98/0xc0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:263 [inline] kmem_cache_alloc_trace+0x1fa/0x480 mm/slab.c:3575 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_ucounts+0x23d/0x5b0 kernel/ucount.c:169 set_cred_ucounts+0x171/0x3a0 kernel/cred.c:684 copy_creds+0x853/0xb20 kernel/cred.c:375 copy_process+0x1413/0x74c0 kernel/fork.c:1992 kernel_clone+0xe7/0xab0 kernel/fork.c:2509 __do_sys_clone+0xc8/0x110 kernel/fork.c:2626 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 4559: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xcd/0x100 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:229 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x106/0x2c0 mm/slab.c:3803 put_ucounts kernel/ucount.c:200 [inline] put_ucounts+0x117/0x150 kernel/ucount.c:192 put_cred_rcu+0x27a/0x520 kernel/cred.c:124 rcu_do_batch kernel/rcu/tree.c:2558 [inline] rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2793 __do_softirq+0x29b/0x9bd kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3038 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3113 rhashtable_rehash_table lib/rhashtable.c:345 [inline] rht_deferred_worker+0x10f9/0x1d70 lib/rhashtable.c:429 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3038 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3113 neigh_parms_release net/core/neighbour.c:1667 [inline] neigh_parms_release+0x1f5/0x280 net/core/neighbour.c:1657 inetdev_destroy net/ipv4/devinet.c:325 [inline] inetdev_event+0xd3d/0x15c0 net/ipv4/devinet.c:1598 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2122 call_netdevice_notifiers_extack net/core/dev.c:2134 [inline] call_netdevice_notifiers net/core/dev.c:2148 [inline] unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11059 ip_tunnel_delete_nets+0x3eb/0x5b0 net/ipv4/ip_tunnel.c:1113 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888080e36500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 64 bytes inside of 192-byte region [ffff888080e36500, ffff888080e365c0) The buggy address belongs to the page: page:ffffea0002038d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888080e36900 pfn:0x80e36 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000648848 ffffea0000620488 ffff888011040000 raw: ffff888080e36900 ffff888080e36000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 15793, ts 781171221552, free_ts 780499279930 prep_new_page mm/page_alloc.c:2445 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4178 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] __do_kmalloc mm/slab.c:3700 [inline] __kmalloc_track_caller+0x3e9/0x4d0 mm/slab.c:3717 kmemdup+0x23/0x50 mm/util.c:128 kmemdup include/linux/fortify-string.h:270 [inline] neigh_parms_alloc+0x7e/0x530 net/core/neighbour.c:1622 ipv6_add_dev+0x2d9/0x1120 net/ipv6/addrconf.c:390 addrconf_notify+0x8d7/0x23e0 net/ipv6/addrconf.c:3491 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2122 call_netdevice_notifiers_extack net/core/dev.c:2134 [inline] call_netdevice_notifiers net/core/dev.c:2148 [inline] register_netdevice+0x106b/0x1500 net/core/dev.c:10346 register_netdev+0x2d/0x50 net/core/dev.c:10439 ip6gre_init_net+0x421/0x620 net/ipv6/ip6_gre.c:1606 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1355 [inline] free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3341 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3420 mm_free_pgd kernel/fork.c:636 [inline] __mmdrop+0xcb/0x3f0 kernel/fork.c:687 mmdrop include/linux/sched/mm.h:49 [inline] __mmput+0x3b4/0x470 kernel/fork.c:1111 mmput+0x58/0x60 kernel/fork.c:1122 free_bprm+0x65/0x2e0 fs/exec.c:1482 kernel_execve+0x380/0x460 fs/exec.c:1979 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888080e36400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888080e36480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888080e36500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888080e36580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888080e36600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================