batman_adv: batadv0: Interface deactivated: batadv_slave_0 ================================================================== BUG: KASAN: use-after-free in ip_tunnel_lookup+0x9d3/0xb70 net/ipv4/ip_tunnel.c:142 Read of size 4 at addr ffff888059c57384 by task ksoftirqd/1/17 CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 4.14.174-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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 ip_tunnel_lookup+0x9d3/0xb70 net/ipv4/ip_tunnel.c:142 vti4_err+0x28f/0x960 net/ipv4/ip_vti.c:334 tunnel4_err+0x81/0x160 net/ipv4/tunnel4.c:157 icmp_socket_deliver+0x1ba/0x330 net/ipv4/icmp.c:773 icmp_unreach+0x2de/0x9d0 net/ipv4/icmp.c:890 icmp_rcv+0x719/0x1300 net/ipv4/icmp.c:1071 ip_local_deliver_finish+0x245/0xaa0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_local_deliver+0x1a6/0x450 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x79b/0x1a10 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_rcv+0x9d8/0xfec net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1e50/0x2c00 net/core/dev.c:4477 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4515 process_backlog+0x214/0x750 net/core/dev.c:5197 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x456/0xe90 net/core/dev.c:5664 __do_softirq+0x254/0x9bf kernel/softirq.c:288 run_ksoftirqd kernel/softirq.c:670 [inline] run_ksoftirqd+0x87/0x1a0 kernel/softirq.c:662 smpboot_thread_fn+0x5c1/0x920 kernel/smpboot.c:164 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 7394: 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_node mm/slab.c:3682 [inline] __kmalloc_node+0x4c/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x46/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:531 [inline] kvzalloc include/linux/mm.h:539 [inline] alloc_netdev_mqs+0x76/0xb70 net/core/dev.c:8097 __ip_tunnel_create+0x16a/0x440 net/ipv4/ip_tunnel.c:269 ip_tunnel_init_net+0x272/0x520 net/ipv4/ip_tunnel.c:1039 vti_init_net+0x2a/0x2f0 net/ipv4/ip_vti.c:497 ops_init+0xa5/0x3c0 net/core/net_namespace.c:118 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 2216: 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 kvfree+0x45/0x50 mm/util.c:416 device_release+0x15f/0x1a0 drivers/base/core.c:833 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x13e/0x1f0 lib/kobject.c:692 netdev_run_todo+0x4a9/0x710 net/core/dev.c:7954 ip_tunnel_delete_net+0x260/0x300 net/ipv4/ip_tunnel.c:1086 ops_exit_list.isra.0+0x9d/0x140 net/core/net_namespace.c:142 cleanup_net+0x3bb/0x820 net/core/net_namespace.c:484 process_one_work+0x813/0x1540 kernel/workqueue.c:2116 worker_thread+0x5d1/0x1070 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 ffff888059c56840 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2884 bytes inside of 4096-byte region [ffff888059c56840, ffff888059c57840) The buggy address belongs to the page: page:ffffea0001671580 count:1 mapcount:0 mapping:ffff888059c56840 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff888059c56840 0000000000000000 0000000100000001 raw: ffffea0001671420 ffffea00016719a0 ffff88812fe56dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888059c57280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888059c57300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888059c57380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888059c57400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888059c57480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================