================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:243 [inline] BUG: KASAN: use-after-free in net_generic include/net/netns/generic.h:40 [inline] BUG: KASAN: use-after-free in xfrm6_tunnel_pernet net/ipv6/xfrm6_tunnel.c:50 [inline] BUG: KASAN: use-after-free in xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:199 [inline] BUG: KASAN: use-after-free in xfrm6_tunnel_destroy+0x5a5/0x630 net/ipv6/xfrm6_tunnel.c:300 Read of size 8 at addr ffff8801cc9cb498 by task kworker/0:3/2559 CPU: 0 PID: 2559 Comm: kworker/0:3 Not tainted 4.9.141+ #1 Workqueue: events xfrm_state_gc_task ffff8801c87ffaa0 ffffffff81b42e79 ffffea0007327200 ffff8801cc9cb498 0000000000000000 ffff8801cc9cb498 ffff8801ca72b4a8 ffff8801c87ffad8 ffffffff815009b8 ffff8801cc9cb498 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 [] __read_once_size include/linux/compiler.h:243 [inline] [] net_generic include/net/netns/generic.h:40 [inline] [] xfrm6_tunnel_pernet net/ipv6/xfrm6_tunnel.c:50 [inline] [] xfrm6_tunnel_free_spi net/ipv6/xfrm6_tunnel.c:199 [inline] [] xfrm6_tunnel_destroy+0x5a5/0x630 net/ipv6/xfrm6_tunnel.c:300 [] xfrm_state_gc_destroy net/xfrm/xfrm_state.c:368 [inline] [] xfrm_state_gc_task+0x3ad/0x510 net/xfrm/xfrm_state.c:388 [] process_one_work+0x831/0x15f0 kernel/workqueue.c:2092 [] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Allocated by task 2109: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:609 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:594 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] kmem_cache_alloc+0xd5/0x2b0 mm/slub.c:2728 kmem_cache_zalloc include/linux/slab.h:626 [inline] net_alloc net/core/net_namespace.c:358 [inline] copy_net_ns+0xf5/0x330 net/core/net_namespace.c:398 create_new_namespaces+0x501/0x760 kernel/nsproxy.c:106 unshare_nsproxy_namespaces+0xa5/0x1d0 kernel/nsproxy.c:205 SYSC_unshare kernel/fork.c:2263 [inline] SyS_unshare+0x319/0x710 kernel/fork.c:2213 do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285 entry_SYSCALL_64_after_swapgs+0x5d/0xdb Freed by task 2119: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kmem_cache_free+0xbe/0x310 mm/slub.c:2980 net_free net/core/net_namespace.c:374 [inline] net_drop_ns+0x62/0x80 net/core/net_namespace.c:381 cleanup_net+0x627/0x8b0 net/core/net_namespace.c:491 process_one_work+0x831/0x15f0 kernel/workqueue.c:2092 worker_thread+0xd6/0x1140 kernel/workqueue.c:2226 kthread+0x26d/0x300 kernel/kthread.c:211 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 The buggy address belongs to the object at ffff8801cc9c9e80 which belongs to the cache net_namespace of size 7552 The buggy address is located 5656 bytes inside of 7552-byte region [ffff8801cc9c9e80, ffff8801cc9cbc00) The buggy address belongs to the page: page:ffffea0007327200 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x4000000000004080(slab|head) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cc9cb380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cc9cb400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801cc9cb480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801cc9cb500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cc9cb580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================