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BUG: KASAN: slab-out-of-bounds in erspan_build_header+0x3bf/0x3d0 net/ipv4/ip_gre.c:698
Read of size 2 at addr ffff8801d766edcb by task syz-executor5/8960

CPU: 1 PID: 8960 Comm: syz-executor5 Not tainted 4.15.0+ #288
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:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440
 erspan_build_header+0x3bf/0x3d0 net/ipv4/ip_gre.c:698
 erspan_xmit+0x3b8/0x13b0 net/ipv4/ip_gre.c:740
 __netdev_start_xmit include/linux/netdevice.h:4042 [inline]
 netdev_start_xmit include/linux/netdevice.h:4051 [inline]
 packet_direct_xmit+0x315/0x6b0 net/packet/af_packet.c:266
 packet_snd net/packet/af_packet.c:2943 [inline]
 packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2968
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:648
 SYSC_sendto+0x361/0x5c0 net/socket.c:1729
 SyS_sendto+0x40/0x50 net/socket.c:1697
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x453299
RSP: 002b:00007f0700724c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 00000000000000b2 RSI: 0000000020011f4e RDI: 0000000000000013
RBP: 00000000000003d6 R08: 000000002000dfe4 R09: 000000000000001c
R10: 0000000000000004 R11: 0000000000000212 R12: 00000000006f4cb0
R13: 00000000ffffffff R14: 00007f07007256d4 R15: 0000000000000000

Allocated by task 1:
 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
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
 kmem_cache_zalloc include/linux/slab.h:678 [inline]
 __kernfs_new_node+0xe2/0x570 fs/kernfs/dir.c:633
 kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:679
 __kernfs_create_file+0x4b/0x320 fs/kernfs/file.c:989
 sysfs_add_file_mode_ns+0x220/0x510 fs/sysfs/file.c:307
 sysfs_add_file+0x4e/0x60 fs/sysfs/file.c:320
 sysfs_merge_group+0xef/0x210 fs/sysfs/group.c:295
 dpm_sysfs_add+0x126/0x1c0 drivers/base/power/sysfs.c:656
 device_add+0xc32/0x1650 drivers/base/core.c:1810
 acpi_device_add+0x86d/0x1320 drivers/acpi/scan.c:693
 acpi_add_single_object+0x9aa/0x1d80 drivers/acpi/scan.c:1594
 acpi_bus_check_add+0x380/0xa50 drivers/acpi/scan.c:1830
 acpi_ns_walk_namespace+0x1d1/0x31e drivers/acpi/acpica/nswalk.c:270
 acpi_walk_namespace+0xb5/0xef drivers/acpi/acpica/nsxfeval.c:642
 acpi_bus_scan+0x120/0x150 drivers/acpi/scan.c:2011
 acpi_scan_init+0x3ce/0x848 drivers/acpi/scan.c:2168
 acpi_init+0x830/0x8e6 drivers/acpi/bus.c:1228
 do_one_initcall+0xad/0x357 init/main.c:832
 do_initcall_level init/main.c:898 [inline]
 do_initcalls init/main.c:906 [inline]
 do_basic_setup init/main.c:924 [inline]
 kernel_init_freeable+0x469/0x521 init/main.c:1072
 kernel_init+0x13/0x180 init/main.c:999
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:542

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d766ed20
 which belongs to the cache kernfs_node_cache of size 160
The buggy address is located 11 bytes to the right of
 160-byte region [ffff8801d766ed20, ffff8801d766edc0)
The buggy address belongs to the page:
page:ffffea00075d9b80 count:1 mapcount:0 mapping:ffff8801d766e000 index:0xffff8801d766efee
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d766e000 ffff8801d766efee 0000000100000012
raw: ffffea00075d9a20 ffffea00075d9be0 ffff8801d9e44dc0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d766ec80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801d766ed00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d766ed80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                              ^
 ffff8801d766ee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d766ee80: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00
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