nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
==================================================================
BUG: KASAN: slab-out-of-bounds in skb_gro_receive+0x1092/0x14f0 net/core/skbuff.c:3795
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
Read of size 16 at addr ffff8800946efff0 by task syz-executor.3/7171
8021q: adding VLAN 0 to HW filter on device batadv0

CPU: 1 PID: 7171 Comm: syz-executor.3 Not tainted 4.20.0-rc1+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x16b/0x224 lib/dump_stack.c:113
 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412
 __asan_report_load16_noabort+0x14/0x20 mm/kasan/report.c:434
 skb_gro_receive+0x1092/0x14f0 net/core/skbuff.c:3795
 udp_gro_receive_segment net/ipv4/udp_offload.c:381 [inline]
 call_gro_receive include/linux/netdevice.h:2334 [inline]
 udp_gro_receive+0x8e0/0xf60 net/ipv4/udp_offload.c:410
 udp4_gro_receive+0x505/0xf00 net/ipv4/udp_offload.c:474
 call_gro_receive include/linux/netdevice.h:2334 [inline]
 inet_gro_receive+0xb68/0x10d0 net/ipv4/af_inet.c:1497
 dev_gro_receive+0xbe9/0x22a0 net/core/dev.c:5513
 napi_gro_frags+0x305/0x950 net/core/dev.c:5763
 tun_get_user+0x21b0/0x32c0 drivers/net/tun.c:1948
 tun_chr_write_iter+0xaf/0x150 drivers/net/tun.c:1993
 call_write_iter include/linux/fs.h:1857 [inline]
 do_iter_readv_writev+0x4b8/0x960 fs/read_write.c:680
 do_iter_write+0x128/0x540 fs/read_write.c:959
 vfs_writev+0x16f/0x2d0 fs/read_write.c:1004
 do_writev+0xda/0x260 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x70/0xb0 fs/read_write.c:1109
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c61
Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 b9 fb ff c3 48 83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f2879c08ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000000002a RCX: 0000000000458c61
RDX: 0000000000000001 RSI: 00007f2879c08c00 RDI: 00000000000000f0
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f2879c096d4
R13: 00000000004c76b6 R14: 00000000004dd610 R15: 00000000ffffffff

Allocated by task 7124:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554
 getname_flags+0xb8/0x510 fs/namei.c:140
 getname+0xd/0x10 fs/namei.c:211
 do_sys_open+0x14c/0x350 fs/open.c:1057
 __do_sys_open fs/open.c:1081 [inline]
 __se_sys_open fs/open.c:1076 [inline]
 __x64_sys_open+0x79/0xb0 fs/open.c:1076
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 7124:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x83/0x290 mm/slab.c:3760
 putname+0xa8/0xe0 fs/namei.c:261
 do_sys_open+0x16e/0x350 fs/open.c:1072
 __do_sys_open fs/open.c:1081 [inline]
 __se_sys_open fs/open.c:1076 [inline]
 __x64_sys_open+0x79/0xb0 fs/open.c:1076
 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8800946ee000
 which belongs to the cache names_cache of size 4096
The buggy address is located 4080 bytes to the right of
 4096-byte region [ffff8800946ee000, ffff8800946ef000)
The buggy address belongs to the page:
page:ffffea000251bb80 count:1 mapcount:0 mapping:ffff8800aa42ac40 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffffea00026f9488 ffffea00021c0888 ffff8800aa42ac40
raw: 0000000000000000 ffff8800946ee000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8800946efe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8800946eff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8800946eff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff8800946f0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8800946f0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================