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BUG: KASAN: use-after-free in __skb_flow_dissect+0x9c3/0x59a0 net/core/flow_dissector.c:1090
Read of size 1 at addr ffff88816fe8000e by task syz-executor236/3650

CPU: 0 PID: 3650 Comm: syz-executor236 Not tainted 6.1.0-rc7-syzkaller-00190-g97ee9d1c1696 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x461 mm/kasan/report.c:395
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495
 __skb_flow_dissect+0x9c3/0x59a0 net/core/flow_dissector.c:1090
 skb_flow_dissect_flow_keys include/linux/skbuff.h:1495 [inline]
 ___skb_get_hash net/core/flow_dissector.c:1698 [inline]
 __skb_get_hash+0xba/0x4b0 net/core/flow_dissector.c:1764
 skb_get_hash include/linux/skbuff.h:1537 [inline]
 ip_tunnel_xmit+0x18f4/0x3180 net/ipv4/ip_tunnel.c:730
 ipip_tunnel_xmit+0x417/0x510 net/ipv4/ipip.c:307
 __netdev_start_xmit include/linux/netdevice.h:4840 [inline]
 netdev_start_xmit include/linux/netdevice.h:4854 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x1c2/0x990 net/core/dev.c:3606
 __dev_queue_xmit+0x2cdf/0x3ba0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 neigh_connected_output+0x3c4/0x520 net/core/neighbour.c:1600
 neigh_output include/net/neighbour.h:546 [inline]
 ip_finish_output2+0x78a/0x2180 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+0x31/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_mc_output+0x21f/0x710 net/ipv4/ip_output.c:415
 dst_output include/net/dst.h:445 [inline]
 ip_local_out+0xb3/0x1a0 net/ipv4/ip_output.c:126
 iptunnel_xmit+0x67e/0x9f0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1443/0x3180 net/ipv4/ip_tunnel.c:813
 ipgre_xmit+0x6e4/0x900 net/ipv4/ip_gre.c:661
 __netdev_start_xmit include/linux/netdevice.h:4840 [inline]
 netdev_start_xmit include/linux/netdevice.h:4854 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x1c2/0x990 net/core/dev.c:3606
 __dev_queue_xmit+0x2cdf/0x3ba0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3008 [inline]
 __bpf_tx_skb net/core/filter.c:2116 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2141 [inline]
 __bpf_redirect+0x666/0xe40 net/core/filter.c:2164
 ____bpf_clone_redirect net/core/filter.c:2431 [inline]
 bpf_clone_redirect+0x2b2/0x420 net/core/filter.c:2403
 ___bpf_prog_run+0x37d5/0x7b50 kernel/bpf/core.c:1818
 __bpf_prog_run512+0xa4/0xe0 kernel/bpf/core.c:2043
 bpf_dispatcher_nop_func include/linux/bpf.h:968 [inline]
 __bpf_prog_run include/linux/filter.h:600 [inline]
 bpf_prog_run include/linux/filter.h:607 [inline]
 bpf_test_run+0x37c/0x9c0 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0xbaf/0x1e60 net/bpf/test_run.c:1183
 bpf_prog_test_run kernel/bpf/syscall.c:3630 [inline]
 __sys_bpf+0x1599/0x4f40 kernel/bpf/syscall.c:4983
 __do_sys_bpf kernel/bpf/syscall.c:5069 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5067 [inline]
 __x64_sys_bpf+0x79/0xc0 kernel/bpf/syscall.c:5067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fddb2bcae69
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:00007fff0f541838 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fddb2bcae69
RDX: 0000000000000028 RSI: 0000000020000080 RDI: 000000000000000a
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00007fff0f541850
R13: 00000000000f4240 R14: 000000000000e1d1 R15: 00007fff0f541844
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0005bfa000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16fe80
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 ffffea0005bfa008 ffffea0005bfa008 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:
 ffff88816fe7ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816fe7ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88816fe80000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff88816fe80080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88816fe80100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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