general protection fault, probably for non-canonical address 0xdffffc000000001f: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000f8-0x00000000000000ff]
CPU: 0 PID: 7819 Comm: syz.9.1056 Not tainted 6.1.128-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:xdp_ok_fwd_dev include/linux/filter.h:970 [inline]
RIP: 0010:dev_map_generic_redirect+0xde/0x650 kernel/bpf/devmap.c:668
Code: 48 89 44 24 40 42 0f b6 04 30 84 c0 0f 85 1a 04 00 00 48 89 5c 24 10 8b 03 89 04 24 49 8d 9f c0 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 12 04 00 00 8b 1b 89 de 83 e6 01 31 ff
RSP: 0018:ffffc90004977720 EFLAGS: 00010203
RAX: 000000000000001f RBX: 00000000000000ff RCX: 0000000000080000
RDX: ffffc9000f232000 RSI: 0000000000000753 RDI: 0000000000000754
RBP: ffffc90004977878 R08: ffffffff88b0f1c0 R09: ffffffff88b0f072
R10: 0000000000000004 R11: ffff888031100000 R12: ffff888060a3a500
R13: 1ffff9200092eef0 R14: dffffc0000000000 R15: 000000000000003f
FS:  00007f5f575ff6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 0000000057d08000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 xdp_do_generic_redirect_map net/core/filter.c:4416 [inline]
 xdp_do_generic_redirect+0x4bf/0x850 net/core/filter.c:4475
 do_xdp_generic+0x50b/0x6d0 net/core/dev.c:4957
 tun_get_user+0x261e/0x42d0 drivers/net/tun.c:1920
 tun_chr_write_iter+0x10c/0x1f0 drivers/net/tun.c:2044
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x857/0xbc0 fs/read_write.c:584
 ksys_write+0x19c/0x2c0 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5f5778b85f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f5f575ff000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5f579a5fa0 RCX: 00007f5f5778b85f
RDX: 000000000000fe53 RSI: 0000000020000440 RDI: 00000000000000c8
RBP: 00007f5f5780e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fe53 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5f579a5fa0 R15: 00007ffc1d782d98
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xdp_ok_fwd_dev include/linux/filter.h:970 [inline]
RIP: 0010:dev_map_generic_redirect+0xde/0x650 kernel/bpf/devmap.c:668
Code: 48 89 44 24 40 42 0f b6 04 30 84 c0 0f 85 1a 04 00 00 48 89 5c 24 10 8b 03 89 04 24 49 8d 9f c0 00 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 12 04 00 00 8b 1b 89 de 83 e6 01 31 ff
RSP: 0018:ffffc90004977720 EFLAGS: 00010203
RAX: 000000000000001f RBX: 00000000000000ff RCX: 0000000000080000
RDX: ffffc9000f232000 RSI: 0000000000000753 RDI: 0000000000000754
RBP: ffffc90004977878 R08: ffffffff88b0f1c0 R09: ffffffff88b0f072
R10: 0000000000000004 R11: ffff888031100000 R12: ffff888060a3a500
R13: 1ffff9200092eef0 R14: dffffc0000000000 R15: 000000000000003f
FS:  00007f5f575ff6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 0000000057d08000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 89 44 24 40       	mov    %rax,0x40(%rsp)
   5:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
   a:	84 c0                	test   %al,%al
   c:	0f 85 1a 04 00 00    	jne    0x42c
  12:	48 89 5c 24 10       	mov    %rbx,0x10(%rsp)
  17:	8b 03                	mov    (%rbx),%eax
  19:	89 04 24             	mov    %eax,(%rsp)
  1c:	49 8d 9f c0 00 00 00 	lea    0xc0(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 12 04 00 00    	jne    0x449
  37:	8b 1b                	mov    (%rbx),%ebx
  39:	89 de                	mov    %ebx,%esi
  3b:	83 e6 01             	and    $0x1,%esi
  3e:	31 ff                	xor    %edi,%edi