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SubjectRe: [PATCH RESEND RESEND] media: uvc: Avoid cyclic entity chains due to malformed USB descriptors
On Mon, Dec 16, 2019 at 02:17:52PM +0100, Andrey Konovalov wrote:
> On Mon, Dec 16, 2019 at 1:16 PM Will Deacon <will@kernel.org> wrote:
> > On Fri, Nov 08, 2019 at 05:55:03PM +0200, Laurent Pinchart wrote:
> > > Thank you for the patch.
> > >
> > > I'm sorry for the delay, and will have to ask you to be a bit more
> > > patient I'm afraid. I will leave tomorrow for a week without computer
> > > access and will only be able to go through my backlog when I will be
> > > back on the 17th.
> >
> > Gentle reminder on this, now you've been back a month ;)
>
> I think we now have a reproducer for this issue that syzbot just reported:
>
> https://syzkaller.appspot.com/bug?extid=0a5c96772a9b26f2a876
>
> You can try you patch on it :)

Oh wow, I *really* like the raw USB gadget thingy you have to reproduce
these! I also really like that this patch fixes the issue. Logs below.

Laurent -- can we please merge this now?

Will

--->8

Before:

bash-5.0# ./repro
[ 31.749418][ T92] usb 1-1: new high-speed USB device number 2 using dummy_hcd
[ 31.989356][ T92] usb 1-1: Using ep0 maxpacket: 8
[ 32.109448][ T92] usb 1-1: config index 0 descriptor too short (expected 51150, got 70)
[ 32.111898][ T92] usb 1-1: config 0 contains an unexpected descriptor of type 0x2, skipping
[ 32.114317][ T92] usb 1-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config
[ 32.117145][ T92] usb 1-1: config 0 interface 0 altsetting 0 has 0 endpoint descriptors, different from the interface descriptor's value: 16
[ 32.120554][ T92] usb 1-1: New USB device found, idVendor=0bd3, idProduct=0755, bcdDevice=69.f1
[ 32.122875][ T92] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 32.126602][ T92] usb 1-1: config 0 descriptor??
[ 32.399436][ T92] usb 1-1: string descriptor 0 read error: -71
[ 32.401266][ T92] uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0755)
[ 32.403266][ T92] ------------[ cut here ]------------
[ 32.404790][ T92] list_add double add: new=ffff888015992010, prev=ffff888015992010, next=ffff8880146c6a18.
[ 32.407819][ T92] WARNING: CPU: 2 PID: 92 at lib/list_debug.c:31 __list_add_valid+0xab/0xe0
[ 32.410214][ T92] Modules linked in:
[ 32.411071][ T92] CPU: 2 PID: 92 Comm: kworker/2:1 Not tainted 5.5.0-rc2+ #1
[ 32.412432][ T92] Workqueue: usb_hub_wq hub_event
[ 32.413364][ T92] RIP: 0010:__list_add_valid+0xab/0xe0
[ 32.414382][ T92] Code: 48 c7 c7 a0 ae fa 85 48 89 de e8 19 eb 2a ff 0f 0b 31 c0 eb cc 48 89 f2 48 89 d9 48 89 ee 48 c7 c7 20 af fa 85 e8 fe ea 2a ff <0f> 0b 31 c0 eb b1 48 89 34 24 e8 36 e8 7e ff 48 8b 34 24 e9 68 ff
[ 32.418007][ T92] RSP: 0018:ffff8880158d7008 EFLAGS: 00010286
[ 32.419127][ T92] RAX: 0000000000000000 RBX: ffff8880146c6a18 RCX: ffffffff81293978
[ 32.420589][ T92] RDX: 0000000000000000 RSI: ffffffff812990fc RDI: 0000000000000006
[ 32.421692][ T92] RBP: ffff888015992010 R08: ffff88801551de80 R09: fffffbfff11ea4b5
[ 32.422744][ T92] R10: fffffbfff11ea4b4 R11: ffffffff88f525a7 R12: dffffc0000000000
[ 32.423784][ T92] R13: ffff888015992000 R14: ffff8880146c6a20 R15: ffff8880146c6a18
[ 32.424838][ T92] FS: 0000000000000000(0000) GS:ffff888016800000(0000) knlGS:0000000000000000
[ 32.425996][ T92] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 32.426867][ T92] CR2: 0000000000478f10 CR3: 000000001327e005 CR4: 0000000000760ea0
[ 32.427935][ T92] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 32.428972][ T92] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 32.430012][ T92] PKRU: 55555554
[ 32.430473][ T92] Call Trace:
[ 32.430944][ T92] uvc_scan_chain_forward.isra.9+0x4df/0x635
[ 32.431600][ T92] uvc_probe.cold.19+0x1ef2/0x29bc
[ 32.432175][ T92] ? __lock_acquire+0xeda/0x41a0
[ 32.432712][ T92] ? mark_lock+0xbe/0x10f0
[ 32.433209][ T92] ? pm_runtime_enable+0x2a/0x310
[ 32.433773][ T92] ? find_held_lock+0x33/0x1c0
[ 32.434307][ T92] ? usb_probe_interface+0x307/0x7b0
[ 32.434869][ T92] usb_probe_interface+0x307/0x7b0
[ 32.435414][ T92] ? usb_probe_device+0xf0/0xf0
[ 32.435938][ T92] really_probe+0x281/0x700
[ 32.436424][ T92] ? driver_allows_async_probing+0x150/0x150
[ 32.437065][ T92] driver_probe_device+0x105/0x200
[ 32.437611][ T92] __device_attach_driver+0x1b9/0x230
[ 32.438190][ T92] bus_for_each_drv+0x156/0x1d0
[ 32.438708][ T92] ? bus_rescan_devices+0x20/0x20
[ 32.439248][ T92] ? lockdep_hardirqs_on+0x388/0x570
[ 32.439812][ T92] __device_attach+0x20b/0x350
[ 32.440323][ T92] ? device_bind_driver+0xc0/0xc0
[ 32.440870][ T92] bus_probe_device+0x1e5/0x290
[ 32.441386][ T92] device_add+0x1420/0x1b90
[ 32.441887][ T92] ? wait_for_completion+0x3c0/0x3c0
[ 32.442466][ T92] ? device_link_remove+0x150/0x150
[ 32.443037][ T92] usb_set_configuration+0xd6f/0x1750
[ 32.443633][ T92] generic_probe+0x95/0xcd
[ 32.444146][ T92] usb_probe_device+0x97/0xf0
[ 32.444650][ T92] ? usb_suspend+0x630/0x630
[ 32.445151][ T92] really_probe+0x281/0x700
[ 32.445642][ T92] ? driver_allows_async_probing+0x150/0x150
[ 32.446299][ T92] driver_probe_device+0x105/0x200
[ 32.446857][ T92] __device_attach_driver+0x1b9/0x230
[ 32.447448][ T92] bus_for_each_drv+0x156/0x1d0
[ 32.447981][ T92] ? bus_rescan_devices+0x20/0x20
[ 32.448523][ T92] ? lockdep_hardirqs_on+0x388/0x570
[ 32.449095][ T92] __device_attach+0x20b/0x350
[ 32.449612][ T92] ? device_bind_driver+0xc0/0xc0
[ 32.450167][ T92] bus_probe_device+0x1e5/0x290
[ 32.450686][ T92] device_add+0x1420/0x1b90
[ 32.451164][ T92] ? device_link_remove+0x150/0x150
[ 32.451715][ T92] ? _raw_spin_unlock_irq+0x1f/0x30
[ 32.452267][ T92] usb_new_device.cold.65+0x66e/0xe63
[ 32.452835][ T92] hub_event+0x1ebd/0x3810
[ 32.453300][ T92] ? hub_port_debounce+0x270/0x270
[ 32.453837][ T92] ? __lock_acquire+0xeda/0x41a0
[ 32.454389][ T92] ? find_held_lock+0x33/0x1c0
[ 32.454904][ T92] ? process_one_work+0x8fc/0x1720
[ 32.455445][ T92] ? mark_held_locks+0x110/0x110
[ 32.455954][ T92] ? rcu_read_lock_sched_held+0x9c/0xd0
[ 32.456536][ T92] ? rcu_read_lock_bh_held+0xb0/0xb0
[ 32.457093][ T92] process_one_work+0x9f2/0x1720
[ 32.457616][ T92] ? mark_held_locks+0x110/0x110
[ 32.458138][ T92] ? pwq_dec_nr_in_flight+0x310/0x310
[ 32.458701][ T92] ? do_raw_spin_lock+0x11b/0x280
[ 32.459237][ T92] worker_thread+0x8c/0xd10
[ 32.459715][ T92] ? process_one_work+0x1720/0x1720
[ 32.460266][ T92] kthread+0x352/0x420
[ 32.460702][ T92] ? kthread_create_on_node+0xe0/0xe0
[ 32.461275][ T92] ret_from_fork+0x24/0x30
[ 32.461738][ T92] irq event stamp: 2238
[ 32.462183][ T92] hardirqs last enabled at (2237): [<ffffffff81293b92>] console_unlock+0x8f2/0xc40
[ 32.463174][ T92] hardirqs last disabled at (2238): [<ffffffff8100468d>] trace_hardirqs_off_thunk+0x1a/0x1c
[ 32.464244][ T92] softirqs last enabled at (1196): [<ffffffff85c00643>] __do_softirq+0x643/0x8fc
[ 32.465225][ T92] softirqs last disabled at (1187): [<ffffffff8115a035>] irq_exit+0x175/0x1a0
[ 32.466155][ T92] ---[ end trace ef28d8c60b68a46d ]---
[ 32.466781][ T92] uvcvideo: No valid video chain found.
[ 32.468076][ T92] usb 1-1: USB disconnect, device number 2


After:

bash-5.0# ./repro
[ 19.067221][ T92] usb 1-1: new high-speed USB device number 2 using dummy_hcd
[ 19.307154][ T92] usb 1-1: Using ep0 maxpacket: 8
[ 19.427261][ T92] usb 1-1: config index 0 descriptor too short (expected 51150, got 70)
[ 19.429709][ T92] usb 1-1: config 0 contains an unexpected descriptor of type 0x2, skipping
[ 19.432150][ T92] usb 1-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config
[ 19.435003][ T92] usb 1-1: config 0 interface 0 altsetting 0 has 0 endpoint descriptors, different from the interface descriptor's value: 16
[ 19.438655][ T92] usb 1-1: New USB device found, idVendor=0bd3, idProduct=0755, bcdDevice=69.f1
[ 19.441166][ T92] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 19.445163][ T92] usb 1-1: config 0 descriptor??
[ 19.717195][ T92] usb 1-1: string descriptor 0 read error: -71
[ 19.719038][ T92] uvcvideo: Found UVC 0.00 device <unnamed> (0bd3:0755)
[ 19.721087][ T92] uvcvideo: No valid video chain found.
[ 19.725262][ T92] usb 1-1: USB disconnect, device number 2

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