ip6_tables: ip6tables: counters copy to user failed while replacing table ================================================================== BUG: KASAN: use-after-free in xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:208 [inline] BUG: KASAN: use-after-free in xfrm6_tunnel_destroy+0x4e4/0x560 net/ipv6/xfrm6_tunnel.c:303 Read of size 8 at addr ffff88805bc00940 by task kworker/1:0/18 CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.232-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events xfrm_state_gc_task Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:208 [inline] xfrm6_tunnel_destroy+0x4e4/0x560 net/ipv6/xfrm6_tunnel.c:303 xfrm_state_gc_destroy net/xfrm/xfrm_state.c:449 [inline] xfrm_state_gc_task+0x4ad/0x7e0 net/xfrm/xfrm_state.c:472 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 7987: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15a/0x400 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] ops_init+0xeb/0x3e0 net/core/net_namespace.c:108 setup_net+0x22f/0x530 net/core/net_namespace.c:295 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:419 create_new_namespaces+0x375/0x720 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xa1/0x1d0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2412 [inline] SyS_unshare+0x308/0x7f0 kernel/fork.c:2362 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 25: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 ops_free+0x182/0x2a0 net/core/net_namespace.c:132 ops_free_list net/core/net_namespace.c:154 [inline] ops_free_list net/core/net_namespace.c:148 [inline] cleanup_net+0x464/0x840 net/core/net_namespace.c:488 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff88805bc00940 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 0 bytes inside of 8192-byte region [ffff88805bc00940, ffff88805bc02940) The buggy address belongs to the page: page:ffffea00016f0000 count:1 mapcount:0 mapping:ffff88805bc00940 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff88805bc00940 0000000000000000 0000000100000001 raw: ffffea000170ff20 ffffea000254dc20 ffff88813fe09080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805bc00800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805bc00880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805bc00900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88805bc00980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805bc00a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================