netdev - Re: [syzbot] [kernel?] general protection fault in bnep

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Message-ID: <6768937a.050a0220.226966.0033.GAE@google.com>
Date: Sun, 22 Dec 2024 14:32:26 -0800
From: syzbot <syzbot+6df45dd3d03e1a9aca96@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] general protection fault in bnep_session

syzbot has found a reproducer for the following issue on:

HEAD commit:    bcde95ce32b6 Merge tag 'devicetree-fixes-for-6.13-1' of gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12b0fcf8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4f1586bab1323870
dashboard link: https://syzkaller.appspot.com/bug?extid=6df45dd3d03e1a9aca96
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10b90adf980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-bcde95ce.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d1b2e8d294e3/vmlinux-bcde95ce.xz
kernel image: https://storage.googleapis.com/syzbot-assets/593ff4631acc/bzImage-bcde95ce.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6df45dd3d03e1a9aca96@...kaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 UID: 0 PID: 6160 Comm: kbnepd bnep0 Not tainted 6.13.0-rc3-syzkaller-00301-gbcde95ce32b6 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:klist_put+0x4d/0x1b0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 5f 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 2e 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 7c ce 0c
RSP: 0018:ffffc900047e79c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888033468860 RCX: ffffffff8239c3fd
RDX: 000000000000000b RSI: ffffffff8b1f72c5 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000b92 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88802426bb80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffabd6b5108 CR3: 000000003551a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 device_del+0x1d9/0x9f0 drivers/base/core.c:3831
 unregister_netdevice_many_notify+0x105d/0x1e60 net/core/dev.c:11562
 unregister_netdevice_many net/core/dev.c:11590 [inline]
 unregister_netdevice_queue+0x307/0x3f0 net/core/dev.c:11462
 unregister_netdevice include/linux/netdevice.h:3192 [inline]
 unregister_netdev+0x1c/0x30 net/core/dev.c:11608
 bnep_session+0x21b6/0x2ca0 net/bluetooth/bnep/core.c:525
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_put+0x4d/0x1b0 lib/klist.c:212
Code: c1 ea 03 80 3c 02 00 0f 85 5f 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 23 49 83 e4 fe 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 2e 01 00 00 4c 89 e7 4d 8b 74 24 58 e8 7c ce 0c
RSP: 0018:ffffc900047e79c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888033468860 RCX: ffffffff8239c3fd
RDX: 000000000000000b RSI: ffffffff8b1f72c5 RDI: 0000000000000058
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000b92 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88802426bb80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe5193ea718 CR3: 0000000024a3c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 5f 01 00 00    	jne    0x16c
   d:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  14:	fc ff df
  17:	4c 8b 23             	mov    (%rbx),%r12
  1a:	49 83 e4 fe          	and    $0xfffffffffffffffe,%r12
  1e:	49 8d 7c 24 58       	lea    0x58(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 2e 01 00 00    	jne    0x162
  34:	4c 89 e7             	mov    %r12,%rdi
  37:	4d 8b 74 24 58       	mov    0x58(%r12),%r14
  3c:	e8                   	.byte 0xe8
  3d:	7c ce                	jl     0xd
  3f:	0c                   	.byte 0xc


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.