general protection fault in netdev_unregister_kobject

general protection fault in netdev_unregister_kobject

[sanan.hasanou]

Good day, dear maintainers,

We found a bug using a modified version of syzkaller.

Kernel Branch: 7.0-rc1
Kernel Config: <https://drive.google.com/open?id=1R0DVns3qzvptjvc0SPl0ylIGDOw-Js_9>
Reproducer: <https://drive.google.com/open?id=1RU45wvk731QPN0fF3-Gh8mpSkXgQXQrF>
Thank you!

Best regards,
Sanan Hasanov

Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 1 UID: 0 PID: 246588 Comm: kbnepd bnep0 Tainted: G             L      7.0.0-rc1 #1 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:klist_put lib/klist.c:212 [inline]
RIP: 0010:klist_del+0x4c/0xc0 lib/klist.c:230
Code: f5 49 89 dd 49 c1 ed 03 43 80 7c 3d 00 00 74 08 48 89 df e8 96 39 9e f5 4c 8b 33 49 83 e6 fe 49 8d 7e 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 78 39 9e f5 4d 8b 66 58 4c 89 f7 e8 8c 16
RSP: 0018:ffffc90004d3f7e8 EFLAGS: 00010212
RAX: 000000000000000b RBX: ffff88804d043460 RCX: ffff8880243b9d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000058
RBP: ffffc90004d3f810 R08: ffff888037d5ac33 R09: 1ffff11006fab586
R10: dffffc0000000000 R11: ffffed1006fab587 R12: ffff888050c12618
R13: 1ffff11009a0868c R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880d9cdb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5033991f2c CR3: 000000004fa9b000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 device_del+0x2c2/0xce0 drivers/base/core.c:3855
 netdev_unregister_kobject+0x262/0x380 net/core/net-sysfs.c:2329
 unregister_netdevice_many_notify+0x1ae2/0x1f40 net/core/dev.c:12436
 unregister_netdevice_many net/core/dev.c:12464 [inline]
 unregister_netdevice_queue net/core/dev.c:12278 [inline]
 unregister_netdevice include/linux/netdevice.h:3408 [inline]
 unregister_netdev+0x142/0x1b0 net/core/dev.c:12482
 bnep_session+0x25d7/0x27d0 net/bluetooth/bnep/core.c:525
 kthread+0x355/0x410 kernel/kthread.c:467
 ret_from_fork+0x3a6/0x980 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:klist_put lib/klist.c:212 [inline]
RIP: 0010:klist_del+0x4c/0xc0 lib/klist.c:230
Code: f5 49 89 dd 49 c1 ed 03 43 80 7c 3d 00 00 74 08 48 89 df e8 96 39 9e f5 4c 8b 33 49 83 e6 fe 49 8d 7e 58 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 05 e8 78 39 9e f5 4d 8b 66 58 4c 89 f7 e8 8c 16
RSP: 0018:ffffc90004d3f7e8 EFLAGS: 00010212
RAX: 000000000000000b RBX: ffff88804d043460 RCX: ffff8880243b9d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000058
RBP: ffffc90004d3f810 R08: ffff888037d5ac33 R09: 1ffff11006fab586
R10: dffffc0000000000 R11: ffffed1006fab587 R12: ffff888050c12618
R13: 1ffff11009a0868c R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880d9cdb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc19c5f2160 CR3: 000000004fa9b000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
   0:	f5                   	cmc
   1:	49 89 dd             	mov    %rbx,%r13
   4:	49 c1 ed 03          	shr    $0x3,%r13
   8:	43 80 7c 3d 00 00    	cmpb   $0x0,0x0(%r13,%r15,1)
   e:	74 08                	je     0x18
  10:	48 89 df             	mov    %rbx,%rdi
  13:	e8 96 39 9e f5       	call   0xf59e39ae
  18:	4c 8b 33             	mov    (%rbx),%r14
  1b:	49 83 e6 fe          	and    $0xfffffffffffffffe,%r14
  1f:	49 8d 7e 58          	lea    0x58(%r14),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 05                	je     0x36
  31:	e8 78 39 9e f5       	call   0xf59e39ae
  36:	4d 8b 66 58          	mov    0x58(%r14),%r12
  3a:	4c 89 f7             	mov    %r14,%rdi
  3d:	e8                   	.byte 0xe8
  3e:	8c 16                	mov    %ss,(%rsi)

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