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BUG: KASAN: use-after-free in __skb_flow_dissect+0x12dc/0x5320 net/core/flow_dissector.c:1062
Read of size 1 at addr ffff88816fcc000e by task syz-executor550/3622

CPU: 0 PID: 3622 Comm: syz-executor550 Not tainted 6.0.0-rc1-syzkaller-00066-g3b06a2755758 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 __skb_flow_dissect+0x12dc/0x5320 net/core/flow_dissector.c:1062
 skb_flow_dissect_flow_keys include/linux/skbuff.h:1485 [inline]
 ___skb_get_hash net/core/flow_dissector.c:1667 [inline]
 __skb_get_hash+0xb6/0x4c0 net/core/flow_dissector.c:1733
 skb_get_hash include/linux/skbuff.h:1527 [inline]
 ip_tunnel_xmit+0x18e8/0x3170 net/ipv4/ip_tunnel.c:729
 ipip_tunnel_xmit+0x413/0x510 net/ipv4/ipip.c:307
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
 __dev_queue_xmit+0x2c31/0x3ad0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1557
 neigh_output include/net/neighbour.h:550 [inline]
 ip_finish_output2+0x782/0x2170 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_mc_output+0x21b/0x700 net/ipv4/ip_output.c:415
 dst_output include/net/dst.h:451 [inline]
 ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x67a/0x9e0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1437/0x3170 net/ipv4/ip_tunnel.c:812
 ipgre_xmit+0x6e0/0x900 net/ipv4/ip_gre.c:661
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
 __dev_queue_xmit+0x2c31/0x3ad0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 __bpf_tx_skb net/core/filter.c:2114 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2139 [inline]
 __bpf_redirect+0x666/0xe30 net/core/filter.c:2162
 ____bpf_clone_redirect net/core/filter.c:2429 [inline]
 bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2401
 bpf_prog_801cabf80fc815cd+0x59/0x5e
 bpf_dispatcher_nop_func include/linux/bpf.h:903 [inline]
 __bpf_prog_run include/linux/filter.h:594 [inline]
 bpf_prog_run include/linux/filter.h:601 [inline]
 bpf_test_run+0x381/0x9d0 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0xbab/0x1e60 net/bpf/test_run.c:1141
 bpf_prog_test_run kernel/bpf/syscall.c:3620 [inline]
 __sys_bpf+0x185e/0x6130 kernel/bpf/syscall.c:4971
 __do_sys_bpf kernel/bpf/syscall.c:5057 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5055 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:5055
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3bb6b6dd69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff6a2ff5e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f3bb6b6dd69
RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6a2ff600
R13: 00000000000f4240 R14: 000000000000a07e R15: 00007fff6a2ff5f4
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0005bf3000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16fcc0
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 ffffea0005bf3008 ffffea0005bf3008 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff88816fcbff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816fcbff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88816fcc0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff88816fcc0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816fcc0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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