syzbot

Oops: stack segment: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 14042 Comm: syz.0.2930 Not tainted 6.10.0-rc5-syzkaller-01137-g1c5fc27bc48a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline]
RIP: 0010:____bpf_xdp_redirect net/core/filter.c:4544 [inline]
RIP: 0010:bpf_xdp_redirect+0x59/0x1a0 net/core/filter.c:4542
Code: 81 c3 08 18 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 55 1a 99 f8 48 8b 1b 4c 8d 63 38 4c 89 e5 48 c1 ed 03 <42> 0f b6 44 2d 00 84 c0 0f 85 d0 00 00 00 45 8b 34 24 44 89 f6 83
RSP: 0018:ffffc9000aaf7970 EFLAGS: 00010202
RAX: 1ffff1100536be41 RBX: 0000000000000000 RCX: ffff888029b5da00
RDX: 0000000000000000 RSI: 000000000000a020 RDI: ffffc9000aaf7af0
RBP: 0000000000000007 R08: ffffffff8665e84f R09: 1ffffffff25f78b0
R10: dffffc0000000000 R11: fffffbfff25f78b1 R12: 0000000000000038
R13: dffffc0000000000 R14: ffffc90009f63048 R15: 000000000000a020
FS:  00007f2c699ff6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0bea356dd CR3: 000000007a9bc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bpf_prog_bc55b47b7a2429cd+0x1d/0x1f
 __bpf_prog_run include/linux/filter.h:691 [inline]
 bpf_prog_run_xdp include/net/xdp.h:514 [inline]
 tun_build_skb drivers/net/tun.c:1711 [inline]
 tun_get_user+0x3321/0x4560 drivers/net/tun.c:1819
 tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2048
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2c69f7471f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 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 7c 8c 02 00 48
RSP: 002b:00007f2c699ff010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2c6a103fa0 RCX: 00007f2c69f7471f
RDX: 0000000000000032 RSI: 0000000020001500 RDI: 00000000000000c8
RBP: 00007f2c69ff677e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007f2c6a103fa0 R15: 00007ffd4d9d6998
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline]
RIP: 0010:____bpf_xdp_redirect net/core/filter.c:4544 [inline]
RIP: 0010:bpf_xdp_redirect+0x59/0x1a0 net/core/filter.c:4542
Code: 81 c3 08 18 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 55 1a 99 f8 48 8b 1b 4c 8d 63 38 4c 89 e5 48 c1 ed 03 <42> 0f b6 44 2d 00 84 c0 0f 85 d0 00 00 00 45 8b 34 24 44 89 f6 83
RSP: 0018:ffffc9000aaf7970 EFLAGS: 00010202
RAX: 1ffff1100536be41 RBX: 0000000000000000 RCX: ffff888029b5da00
RDX: 0000000000000000 RSI: 000000000000a020 RDI: ffffc9000aaf7af0
RBP: 0000000000000007 R08: ffffffff8665e84f R09: 1ffffffff25f78b0
R10: dffffc0000000000 R11: fffffbfff25f78b1 R12: 0000000000000038
R13: dffffc0000000000 R14: ffffc90009f63048 R15: 000000000000a020
FS:  00007f2c699ff6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0bea356dd CR3: 000000007a9bc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	81 c3 08 18 00 00    	add    $0x1808,%ebx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 55 1a 99 f8       	call   0xf8991a71
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	4c 8d 63 38          	lea    0x38(%rbx),%r12
  23:	4c 89 e5             	mov    %r12,%rbp
  26:	48 c1 ed 03          	shr    $0x3,%rbp
* 2a:	42 0f b6 44 2d 00    	movzbl 0x0(%rbp,%r13,1),%eax <-- trapping instruction
  30:	84 c0                	test   %al,%al
  32:	0f 85 d0 00 00 00    	jne    0x108
  38:	45 8b 34 24          	mov    (%r12),%r14d
  3c:	44 89 f6             	mov    %r14d,%esi
  3f:	83                   	.byte 0x83