protocol 86dd is buggy, dev ip6tnl1
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BUG: KASAN: slab-out-of-bounds in ip6_tnl_parse_tlv_enc_lim+0x4b7/0x550 net/ipv6/ip6_tunnel.c:449
Read of size 1 at addr ffff8801a3505387 by task syz-executor0/23853

CPU: 1 PID: 23853 Comm: syz-executor0 Not tainted 4.14.78+ #26
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 ip6_tnl_parse_tlv_enc_lim+0x4b7/0x550 net/ipv6/ip6_tunnel.c:449
 ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1339 [inline]
 ip6_tnl_start_xmit+0xfe5/0x1aa0 net/ipv6/ip6_tunnel.c:1403
 __netdev_start_xmit include/linux/netdevice.h:4030 [inline]
 netdev_start_xmit include/linux/netdevice.h:4039 [inline]
 xmit_one net/core/dev.c:3009 [inline]
 dev_hard_start_xmit+0x191/0x890 net/core/dev.c:3025
 __dev_queue_xmit+0x13d9/0x1f40 net/core/dev.c:3525
 __bpf_tx_skb net/core/filter.c:1708 [inline]
 __bpf_redirect_common net/core/filter.c:1746 [inline]
 __bpf_redirect+0x5b0/0x990 net/core/filter.c:1753
 ____bpf_clone_redirect net/core/filter.c:1786 [inline]
 bpf_clone_redirect+0x1d4/0x2b0 net/core/filter.c:1758
 ___bpf_prog_run+0x248e/0x5c70 kernel/bpf/core.c:1012
F2FS-fs (loop4): Unable to read 1th superblock
F2FS-fs (loop4): Unable to read 2th superblock
F2FS-fs (loop4): Unable to read 1th superblock
F2FS-fs (loop4): Unable to read 2th superblock
netlink: 4 bytes leftover after parsing attributes in process `syz-executor5'.
netlink: 4 bytes leftover after parsing attributes in process `syz-executor5'.

Allocated by task 23853:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551
 __kmalloc+0x153/0x340 mm/slub.c:3760
 kmalloc include/linux/slab.h:493 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 bpf_test_init.isra.1+0x52/0xc0 net/bpf/test_run.c:81
 bpf_prog_test_run_skb+0xfb/0x8c0 net/bpf/test_run.c:103
 bpf_prog_test_run kernel/bpf/syscall.c:1330 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1602 [inline]
 SyS_bpf+0x79d/0x3640 kernel/bpf/syscall.c:1547
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=23860 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=23860 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=23886 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=23889 comm=syz-executor2
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

Freed by task 21429:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:524
 slab_free_hook mm/slub.c:1389 [inline]
 slab_free_freelist_hook mm/slub.c:1410 [inline]
 slab_free mm/slub.c:2966 [inline]
 kfree+0xf5/0x310 mm/slub.c:3897
 free_states kernel/bpf/verifier.c:4495 [inline]
 bpf_check+0x550/0x17c0 kernel/bpf/verifier.c:4583
 bpf_prog_load+0x6aa/0xe20 kernel/bpf/syscall.c:1125
 SYSC_bpf kernel/bpf/syscall.c:1585 [inline]
 SyS_bpf+0x1053/0x3640 kernel/bpf/syscall.c:1547
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff8801a3505180
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 7 bytes to the right of
 512-byte region [ffff8801a3505180, ffff8801a3505380)
The buggy address belongs to the page:
page:ffffea00068d4100 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
flags: 0x4000000000008100(slab|head)
raw: 4000000000008100 0000000000000000 0000000000000000 00000001800c000c
raw: dead000000000100 dead000000000200 ffff8801da802c00 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801a3505280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801a3505300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801a3505380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801a3505400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801a3505480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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