================================================================== BUG: KASAN: use-after-free in inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] BUG: KASAN: use-after-free in tcp_sk_exit+0x20d/0x240 net/ipv4/tcp_ipv4.c:2598 Read of size 8 at addr ffff88809869eeac by task kworker/u4:7/10439 CPU: 1 PID: 10439 Comm: kworker/u4:7 Not tainted 5.2.0-rc3+ #22 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:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] tcp_sk_exit+0x20d/0x240 net/ipv4/tcp_ipv4.c:2598 ops_exit_list.isra.0+0xaa/0x150 net/core/net_namespace.c:154 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:553 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 30129: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:497 slab_post_alloc_hook mm/slab.h:437 [inline] slab_alloc mm/slab.c:3326 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3488 sk_prot_alloc+0x67/0x2e0 net/core/sock.c:1596 sk_alloc+0x39/0xf70 net/core/sock.c:1656 inet_create net/ipv4/af_inet.c:321 [inline] inet_create+0x36a/0xe00 net/ipv4/af_inet.c:247 __sock_create+0x3d8/0x730 net/socket.c:1424 sock_create_kern+0x3b/0x50 net/socket.c:1493 inet_ctl_sock_create+0x9d/0x1f0 net/ipv4/af_inet.c:1620 icmp_sk_init+0x11c/0x4c0 net/ipv4/icmp.c:1199 ops_init+0xb3/0x410 net/core/net_namespace.c:130 setup_net+0x2d3/0x740 net/core/net_namespace.c:316 copy_net_ns+0x1df/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2692 __do_sys_unshare kernel/fork.c:2760 [inline] __se_sys_unshare kernel/fork.c:2758 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2758 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 30129: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3432 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3698 sk_prot_free net/core/sock.c:1637 [inline] __sk_destruct+0x4bc/0x6e0 net/core/sock.c:1725 sk_destruct+0x7b/0x90 net/core/sock.c:1733 __sk_free+0xce/0x300 net/core/sock.c:1744 sk_free+0x42/0x50 net/core/sock.c:1755 sock_put include/net/sock.h:1723 [inline] sk_common_release+0x21c/0x330 net/core/sock.c:3175 raw_close+0x22/0x30 net/ipv4/raw.c:704 inet_release+0xe0/0x1f0 net/ipv4/af_inet.c:427 __sock_release+0x1f4/0x2a0 net/socket.c:601 sock_release+0x18/0x20 net/socket.c:621 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline] icmp_sk_exit+0x11f/0x1f0 net/ipv4/icmp.c:1183 ops_exit_list.isra.0+0xaa/0x150 net/core/net_namespace.c:154 setup_net+0x400/0x740 net/core/net_namespace.c:333 copy_net_ns+0x1df/0x340 net/core/net_namespace.c:439 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2692 __do_sys_unshare kernel/fork.c:2760 [inline] __se_sys_unshare kernel/fork.c:2758 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2758 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809869edc0 which belongs to the cache RAW(81:syz5) of size 1352 The buggy address is located 236 bytes inside of 1352-byte region [ffff88809869edc0, ffff88809869f308) The buggy address belongs to the page: page:ffffea000261a780 refcount:1 mapcount:0 mapping:ffff88808509cd80 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00023f8d08 ffffea0001969d08 ffff88808509cd80 raw: 0000000000000000 ffff88809869e1c0 0000000100000005 ffff888066084ac0 page dumped because: kasan: bad access detected page->mem_cgroup:ffff888066084ac0 Memory state around the buggy address: ffff88809869ed80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88809869ee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809869ee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809869ef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809869ef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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