BUG: unable to handle kernel paging request in ipgre_header

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 19a66b6f3cd8 BACKPORT: Bluetooth: L2CAP: Fix use-after-fre..
git tree: android12-5.4
console+strace: https://syzkaller.appspot.com/x/log.txt?x=11b486fa080000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bd86c313f835e4
dashboard link: https://syzkaller.appspot.com/bug?extid=9cc815719012e9587870
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111ef716080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13461df2080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9cc815...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: ffffed105b877fff
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23fff3067 P4D 23fff3067 PUD 23fff1067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 467 Comm: syz-executor300 Not tainted 5.4.197-syzkaller-00007-g19a66b6f3cd8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:ipgre_header+0x10e/0x470 net/ipv4/ip_gre.c:831
Code: 41 81 e7 00 40 00 00 44 0f 44 e5 31 ff 44 89 fe e8 57 11 c6 fd 49 8d 6e 01 4c 89 f0 48 c1 e8 03 48 ba 00 00 00 00 00 fc ff df <8a> 04 10 84 c0 0f 85 c4 01 00 00 48 89 e8 48 c1 e8 03 8a 04 10 84
RSP: 0018:ffff8881f6e099c0 EFLAGS: 00010a07
RAX: 1ffff1105b877fff RBX: ffff8882dc3bffe8 RCX: 0000000080000302
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8882dc3bfffd R08: ffffffff839a4549 R09: 0000000000010038
R10: ffff8881f2bd8fc0 R11: 0000000000000003 R12: 0000000000000000
R13: ffff8881dd706000 R14: ffff8882dc3bfffc R15: 0000000000000000
FS: 0000555555ebd300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed105b877fff CR3: 00000001f3cc7000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
dev_hard_header include/linux/netdevice.h:2997 [inline]
neigh_connected_output+0x278/0x430 net/core/neighbour.c:1524
neigh_output include/net/neighbour.h:525 [inline]
ip6_finish_output2+0xfde/0x1800 net/ipv6/ip6_output.c:144
NF_HOOK_COND include/linux/netfilter.h:297 [inline]
ip6_output+0x158/0x380 net/ipv6/ip6_output.c:242
dst_output include/net/dst.h:444 [inline]
NF_HOOK include/linux/netfilter.h:308 [inline]
ndisc_send_skb+0x669/0xb80 net/ipv6/ndisc.c:508
addrconf_rs_timer+0x254/0x510 net/ipv6/addrconf.c:3919
call_timer_fn+0x31/0x350 kernel/time/timer.c:1418
expire_timers+0x21e/0x400 kernel/time/timer.c:1463
__run_timers+0x5b0/0x6b0 kernel/time/timer.c:1787
run_timer_softirq+0x46/0x80 kernel/time/timer.c:1800
__do_softirq+0x23e/0x643 kernel/softirq.c:292
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1083
</IRQ>
do_softirq+0xdc/0x110 kernel/softirq.c:337
__local_bh_enable_ip+0x6a/0x70 kernel/softirq.c:189
rcu_read_unlock_bh include/linux/rcupdate.h:690 [inline]
__dev_queue_xmit+0x1593/0x2840 net/core/dev.c:3816
__bpf_tx_skb net/core/filter.c:2063 [inline]
__bpf_redirect_no_mac net/core/filter.c:2088 [inline]
__bpf_redirect+0x6f2/0xcc0 net/core/filter.c:2111
____bpf_clone_redirect net/core/filter.c:2142 [inline]
bpf_clone_redirect+0x243/0x350 net/core/filter.c:2114
Modules linked in:
CR2: ffffed105b877fff
---[ end trace ba757af6bd8ea89d ]---
RIP: 0010:ipgre_header+0x10e/0x470 net/ipv4/ip_gre.c:831
Code: 41 81 e7 00 40 00 00 44 0f 44 e5 31 ff 44 89 fe e8 57 11 c6 fd 49 8d 6e 01 4c 89 f0 48 c1 e8 03 48 ba 00 00 00 00 00 fc ff df <8a> 04 10 84 c0 0f 85 c4 01 00 00 48 89 e8 48 c1 e8 03 8a 04 10 84
RSP: 0018:ffff8881f6e099c0 EFLAGS: 00010a07
RAX: 1ffff1105b877fff RBX: ffff8882dc3bffe8 RCX: 0000000080000302
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8882dc3bfffd R08: ffffffff839a4549 R09: 0000000000010038
R10: ffff8881f2bd8fc0 R11: 0000000000000003 R12: 0000000000000000
R13: ffff8881dd706000 R14: ffff8882dc3bfffc R15: 0000000000000000
FS: 0000555555ebd300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed105b877fff CR3: 00000001f3cc7000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 41 81 e7 00 40 00 00 and $0x4000,%r15d
7: 44 0f 44 e5 cmove %ebp,%r12d
b: 31 ff xor %edi,%edi
d: 44 89 fe mov %r15d,%esi
10: e8 57 11 c6 fd callq 0xfdc6116c
15: 49 8d 6e 01 lea 0x1(%r14),%rbp
19: 4c 89 f0 mov %r14,%rax
1c: 48 c1 e8 03 shr $0x3,%rax
20: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
27: fc ff df
* 2a: 8a 04 10 mov (%rax,%rdx,1),%al <-- trapping instruction
2d: 84 c0 test %al,%al
2f: 0f 85 c4 01 00 00 jne 0x1f9
35: 48 89 e8 mov %rbp,%rax
38: 48 c1 e8 03 shr $0x3,%rax
3c: 8a 04 10 mov (%rax,%rdx,1),%al
3f: 84 .byte 0x84


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