================================================================== BUG: KASAN: use-after-free in deliver_ptype_list_skb net/core/dev.c:1871 [inline] BUG: KASAN: use-after-free in __netif_receive_skb_core+0x2be3/0x33d0 net/core/dev.c:4406 Read of size 2 at addr ffff88006abd6900 by task sshd/2974 CPU: 0 PID: 2974 Comm: sshd Not tainted 4.14.0-rc1-next-20170919+ #7 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x24e/0x340 mm/kasan/report.c:409 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428 deliver_ptype_list_skb net/core/dev.c:1871 [inline] __netif_receive_skb_core+0x2be3/0x33d0 net/core/dev.c:4406 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4461 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4534 napi_skb_finish net/core/dev.c:4895 [inline] napi_gro_receive+0x3d0/0x500 net/core/dev.c:4926 e1000_receive_skb drivers/net/ethernet/intel/e1000/e1000_main.c:4018 [inline] e1000_clean_rx_irq+0x58d/0x1330 drivers/net/ethernet/intel/e1000/e1000_main.c:4474 e1000_clean+0xb39/0x2610 drivers/net/ethernet/intel/e1000/e1000_main.c:3819 napi_poll net/core/dev.c:5537 [inline] net_rx_action+0x792/0x1910 net/core/dev.c:5603 __do_softirq+0x2bb/0xbd0 kernel/softirq.c:284 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:957 do_softirq.part.20+0x14d/0x190 kernel/softirq.c:328 do_softirq kernel/softirq.c:176 [inline] __local_bh_enable_ip+0x135/0x160 kernel/softirq.c:181 local_bh_enable include/linux/bottom_half.h:31 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:726 [inline] ip_finish_output2+0x8ad/0x1460 net/ipv4/ip_output.c:231 ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:238 [inline] ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:472 [inline] ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124 ip_queue_xmit+0x8c6/0x18e0 net/ipv4/ip_output.c:504 tcp_transmit_skb+0x19a1/0x3450 net/ipv4/tcp_output.c:1123 tcp_write_xmit+0x5fc/0x4960 net/ipv4/tcp_output.c:2344 tcp_push_one+0xb5/0xe0 net/ipv4/tcp_output.c:2533 tcp_sendmsg_locked+0x1d6a/0x3bc0 net/ipv4/tcp.c:1388 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1445 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 sock_write_iter+0x320/0x5e0 net/socket.c:912 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x7f5f60e26370 RSP: 002b:00007ffdca040898 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000001298 RCX: 00007f5f60e26370 RDX: 0000000000001298 RSI: 000056077c12fe90 RDI: 0000000000000003 RBP: 0000000000000082 R08: 0000000000000001 R09: 0101010101010101 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000079b85c6c R13: 0000000000790000 R14: 00007f5f61ee1a00 R15: 000056077c11bb80 Allocated by task 14082: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627 kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:666 [inline] fanout_add+0xa50/0x1190 net/packet/af_packet.c:1733 packet_setsockopt+0xfdc/0x1e80 net/packet/af_packet.c:3795 SYSC_setsockopt net/socket.c:1852 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1831 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 14082: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 packet_release+0xa8f/0xd70 net/packet/af_packet.c:3033 sock_release+0x8d/0x1e0 net/socket.c:597 sock_close+0x16/0x20 net/socket.c:1126 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:112 exit_task_work include/linux/task_work.h:21 [inline] do_exit+0xa52/0x1b40 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x7e8/0x17e0 kernel/signal.c:2334 do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808 exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe The buggy address belongs to the object at ffff88006abd6080 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2176 bytes inside of 4096-byte region [ffff88006abd6080, ffff88006abd7080) The buggy address belongs to the page: page:ffffea0001aaf580 count:1 mapcount:0 mapping:ffff88006abd6080 index:0x0 compound_mapcount: 0 flags: 0x500000000008100(slab|head) raw: 0500000000008100 ffff88006abd6080 0000000000000000 0000000100000001 raw: ffffea0001a564a0 ffffea0001a731a0 ffff88003e800dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88006abd6800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88006abd6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88006abd6900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88006abd6980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88006abd6a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================