================================================================== BUG: KASAN: use-after-free in eth_header_parse_protocol+0xdc/0xe0 net/ethernet/eth.c:283 Read of size 2 at addr ffff8880644a300b by task syz-executor.4/15110 CPU: 1 PID: 15110 Comm: syz-executor.4 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 eth_header_parse_protocol+0xdc/0xe0 net/ethernet/eth.c:283 dev_parse_header_protocol include/linux/netdevice.h:3264 [inline] virtio_net_hdr_to_skb.constprop.0+0x99d/0xcd0 include/linux/virtio_net.h:83 packet_snd net/packet/af_packet.c:2994 [inline] packet_sendmsg+0x233c/0x5300 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 sock_no_sendpage+0xf3/0x130 net/core/sock.c:2860 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3631 kernel_sendpage net/socket.c:3628 [inline] sock_sendpage+0xe5/0x140 net/socket.c:947 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0xb7e/0x1940 fs/splice.c:1079 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1332 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8b4877a188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000466459 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 000000000004ffe0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffd86853a7f R14: 00007f8b4877a300 R15: 0000000000022000 Allocated by task 13287: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:559 [inline] kzalloc include/linux/slab.h:684 [inline] __register_sysctl_table+0x112/0x1090 fs/proc/proc_sysctl.c:1323 __devinet_sysctl_register+0x156/0x280 net/ipv4/devinet.c:2571 devinet_sysctl_register net/ipv4/devinet.c:2611 [inline] devinet_sysctl_register+0x160/0x230 net/ipv4/devinet.c:2601 inetdev_init+0x25d/0x550 net/ipv4/devinet.c:276 inetdev_event+0xa4f/0x15c0 net/ipv4/devinet.c:1530 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] register_netdevice+0x106b/0x1500 net/core/dev.c:10287 __ip_tunnel_create+0x398/0x5c0 net/ipv4/ip_tunnel.c:267 ip_tunnel_init_net+0x330/0x9c0 net/ipv4/ip_tunnel.c:1060 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:333 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:474 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x8e0 kernel/fork.c:2998 __do_sys_unshare kernel/fork.c:3066 [inline] __se_sys_unshare kernel/fork.c:3064 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3064 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 kvfree_call_rcu+0x10e/0x7d0 kernel/rcu/tree.c:3577 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1652 unregister_sysctl_table fs/proc/proc_sysctl.c:1690 [inline] unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1665 __devinet_sysctl_unregister net/ipv4/devinet.c:2594 [inline] devinet_sysctl_unregister net/ipv4/devinet.c:2622 [inline] inetdev_destroy net/ipv4/devinet.c:324 [inline] inetdev_event+0xcbc/0x15c0 net/ipv4/devinet.c:1598 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] unregister_netdevice_many+0x942/0x1780 net/core/dev.c:11000 ip_tunnel_delete_nets+0x3eb/0x5b0 net/ipv4/ip_tunnel.c:1113 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff8880644a3000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 11 bytes inside of 2048-byte region [ffff8880644a3000, ffff8880644a3800) The buggy address belongs to the page: page:ffffea0001912800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880644a0000 pfn:0x644a0 head:ffffea0001912800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 ffffea00006f3e08 ffffea0000a54808 ffff888010842000 raw: ffff8880644a0000 0000000000080002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880644a2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880644a2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880644a3000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880644a3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880644a3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================