IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 ================================================================== 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+0x519/0x5c0 net/ipv6/xfrm6_tunnel.c:303 Read of size 8 at addr ffff88809e0721b8 by task kworker/1:1/23 CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 4.14.173-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+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:208 [inline] xfrm6_tunnel_destroy+0x519/0x5c0 net/ipv6/xfrm6_tunnel.c:303 xfrm_state_gc_destroy net/xfrm/xfrm_state.c:449 [inline] xfrm_state_gc_task+0x4ad/0x7d0 net/xfrm/xfrm_state.c:472 process_one_work+0x813/0x1540 kernel/workqueue.c:2114 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 7443: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7c0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] ops_init+0xe7/0x3c0 net/core/net_namespace.c:108 setup_net+0x22f/0x500 net/core/net_namespace.c:295 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:419 create_new_namespaces+0x375/0x730 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xa5/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2391 [inline] SyS_unshare+0x2ea/0x740 kernel/fork.c:2341 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 878: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 ops_free net/core/net_namespace.c:132 [inline] ops_free_list.part.0+0x1f9/0x330 net/core/net_namespace.c:154 ops_free_list net/core/net_namespace.c:152 [inline] cleanup_net+0x453/0x820 net/core/net_namespace.c:488 process_one_work+0x813/0x1540 kernel/workqueue.c:2114 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248 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 ffff88809e0719c0 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 2040 bytes inside of 8192-byte region [ffff88809e0719c0, ffff88809e0739c0) The buggy address belongs to the page: page:ffffea0002781c00 count:1 mapcount:0 mapping:ffff88809e0719c0 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff88809e0719c0 0000000000000000 0000000100000001 raw: ffffea00026e9b20 ffffea00026d5b20 ffff88812fe55080 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809e072080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809e072100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809e072180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809e072200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809e072280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================