SELinux: unrecognized netlink message: protocol=0 nlmsg_type=44985 sclass=netlink_route_socket pig=5611 comm=syz-executor3
device syz6 entered promiscuous mode
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BUG: KASAN: use-after-free in __tcp_hdrlen include/linux/tcp.h:35 [inline]
BUG: KASAN: use-after-free in tcp_hdrlen include/linux/tcp.h:40 [inline]
BUG: KASAN: use-after-free in qdisc_pkt_len_init net/core/dev.c:3171 [inline]
BUG: KASAN: use-after-free in __dev_queue_xmit+0x297c/0x2b50 net/core/dev.c:3477
Read of size 2 at addr ffff8801c267f168 by task syz-executor6/5635

CPU: 0 PID: 5635 Comm: syz-executor6 Not tainted 4.15.0-rc6-mm1+ #52
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+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report+0x23b/0x360 mm/kasan/report.c:412
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
 __tcp_hdrlen include/linux/tcp.h:35 [inline]
 tcp_hdrlen include/linux/tcp.h:40 [inline]
 qdisc_pkt_len_init net/core/dev.c:3171 [inline]
 __dev_queue_xmit+0x297c/0x2b50 net/core/dev.c:3477
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3566
 packet_snd net/packet/af_packet.c:2944 [inline]
 packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2969
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 sock_write_iter+0x31a/0x5d0 net/socket.c:907
 call_write_iter include/linux/fs.h:1775 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f284337cc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 00000000000000ac RSI: 0000000020859000 RDI: 0000000000000015
RBP: 0000000000000352 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3050
R13: 00000000ffffffff R14: 00007f284337d6d4 R15: 0000000000000000

Allocated by task 3467:
 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:552
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3541
 ptlock_alloc+0x24/0x70 mm/memory.c:4714
 ptlock_init include/linux/mm.h:1796 [inline]
 pgtable_page_ctor include/linux/mm.h:1830 [inline]
 pte_alloc_one+0x59/0x100 arch/x86/mm/pgtable.c:32
 do_fault_around mm/memory.c:3588 [inline]
 do_read_fault mm/memory.c:3629 [inline]
 do_fault mm/memory.c:3734 [inline]
 handle_pte_fault mm/memory.c:3965 [inline]
 __handle_mm_fault+0x3b12/0x3ce0 mm/memory.c:4089
 handle_mm_fault+0x38f/0x930 mm/memory.c:4126
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x4c/0x60 arch/x86/entry/entry_64.S:1243

Freed by task 3467:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527
 __cache_free mm/slab.c:3485 [inline]
 kmem_cache_free+0x86/0x2b0 mm/slab.c:3743
 ptlock_free+0x38/0x42 mm/memory.c:4723
 pte_lock_deinit include/linux/mm.h:1806 [inline]
 pgtable_page_dtor include/linux/mm.h:1838 [inline]
 ___pte_free_tlb+0x4b/0xc0 arch/x86/mm/pgtable.c:58
 __pte_free_tlb arch/x86/include/asm/pgalloc.h:73 [inline]
 free_pte_range mm/memory.c:446 [inline]
 free_pmd_range mm/memory.c:464 [inline]
 free_pud_range mm/memory.c:498 [inline]
 free_p4d_range mm/memory.c:532 [inline]
 free_pgd_range+0xaba/0xd90 mm/memory.c:612
 free_pgtables+0x270/0x330 mm/memory.c:644
 exit_mmap+0x291/0x500 mm/mmap.c:3050
 __mmput kernel/fork.c:971 [inline]
 mmput+0x223/0x6c0 kernel/fork.c:992
 exit_mm kernel/exit.c:544 [inline]
 do_exit+0x90a/0x1ad0 kernel/exit.c:856
 do_group_exit+0x149/0x400 kernel/exit.c:972
 SYSC_exit_group kernel/exit.c:983 [inline]
 SyS_exit_group+0x1d/0x20 kernel/exit.c:981
 entry_SYSCALL_64_fastpath+0x23/0x9a

The buggy address belongs to the object at ffff8801c267f160
 which belongs to the cache page->ptl of size 56
The buggy address is located 8 bytes inside of
 56-byte region [ffff8801c267f160, ffff8801c267f198)
The buggy address belongs to the page:
page:ffffea0007099fc0 count:1 mapcount:0 mapping:ffff8801c267f000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801c267f000 0000000000000000 000000010000002e
raw: ffffea000708dae0 ffffea00070715e0 ffff8801dac10040 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c267f000: fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb fb
 ffff8801c267f080: fb fb fc fc fc fc fb fb fb fb fb fb fb fc fc fc
>ffff8801c267f100: fc fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb
                                                          ^
 ffff8801c267f180: fb fb fb fc fc fc fc fb fb fb fb fb fb fb fc fc
 ffff8801c267f200: fc fc fb fb fb fb fb fb fb fc fc fc fc fb fb fb
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