general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 2 PID: 10526 Comm: syz-executor.2 Not tainted 6.9.0-rc2-syzkaller-00040-gb1e6ec0a0fd0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:dev_map_generic_redirect+0xb9/0x5f0 kernel/bpf/devmap.c:681
Code: 48 c1 e8 03 42 0f b6 04 20 84 c0 74 08 3c 03 0f 8e 50 04 00 00 48 89 ea 44 8b 73 70 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 89 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b
RSP: 0018:ffffc900038df868 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88801961f040 RCX: ffffc9000ca06000
RDX: 0000000000000000 RSI: ffffffff81b3c6d6 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000019
R10: 0000000000000019 R11: 0000000000000001 R12: dffffc0000000000
R13: 1ffff9200071bf13 R14: 000000000000fdef R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802c400000(0063) knlGS:00000000f5f4bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020010000 CR3: 000000005c9c6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 xdp_do_generic_redirect_map net/core/filter.c:4463 [inline]
 xdp_do_generic_redirect+0x2e8/0x700 net/core/filter.c:4520
 do_xdp_generic+0x77f/0xc30 net/core/dev.c:5021
 tun_get_user+0x1ce6/0x3be0 drivers/net/tun.c:1924
 tun_chr_write_iter+0xe8/0x210 drivers/net/tun.c:2048
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6db/0x1100 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x7a/0x120 arch/x86/entry/common.c:321
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:346
 entry_SYSENTER_compat_after_hwframe+0x7f/0x89
RIP: 0023:0xf7351579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5f4b570 EFLAGS: 00000293 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 0000000020000bc0
RDX: 000000000000fdef RSI: 00000000f74a8ff4 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dev_map_generic_redirect+0xb9/0x5f0 kernel/bpf/devmap.c:681
Code: 48 c1 e8 03 42 0f b6 04 20 84 c0 74 08 3c 03 0f 8e 50 04 00 00 48 89 ea 44 8b 73 70 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 89 04 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b
RSP: 0018:ffffc900038df868 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff88801961f040 RCX: ffffc9000ca06000
RDX: 0000000000000000 RSI: ffffffff81b3c6d6 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000019
R10: 0000000000000019 R11: 0000000000000001 R12: dffffc0000000000
R13: 1ffff9200071bf13 R14: 000000000000fdef R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802c400000(0063) knlGS:00000000f5f4bb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020010000 CR3: 000000005c9c6000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 c1 e8 03          	shr    $0x3,%rax
   4:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax
   9:	84 c0                	test   %al,%al
   b:	74 08                	je     0x15
   d:	3c 03                	cmp    $0x3,%al
   f:	0f 8e 50 04 00 00    	jle    0x465
  15:	48 89 ea             	mov    %rbp,%rdx
  18:	44 8b 73 70          	mov    0x70(%rbx),%r14d
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 89 04 00 00    	jne    0x4bd
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	4c                   	rex.WR
  3f:	8b                   	.byte 0x8b