linux-kernel - Re: [PATCH] xhci-ring: Fix Null pointer dereference

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Date:	Thu, 28 Aug 2014 17:09:47 +0200
From:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:	Mathias Nyman <mathias.nyman@...el.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xhci-ring: Fix Null pointer dereference

Sure, but the hw leaves my desk until next monday in 30 minutes.

So unless you send the patch right now you will have to wait for
results until next Monday

Thanks!



On Thu, Aug 28, 2014 at 5:20 PM, Mathias Nyman <mathias.nyman@...el.com> wrote:
> On 08/28/2014 03:36 PM, Ricardo Ribalda Delgado wrote:
>> Hello Mathias
>>
>> This is the dmesg output after your patch. No WARN(), no crash :), but
>> still some weird messages:
>>
>> [  146.511623] usb 2-2: new SuperSpeed USB device number 2 using xhci_hcd
>> [  146.531652] usb 2-2: New USB device found, idVendor=0525, idProduct=a4a5
>> [  146.531661] usb 2-2: New USB device strings: Mfr=3, Product=4, SerialNumber=0
>> [  146.531666] usb 2-2: Product: Mass Storage Gadget
>> [  146.531670] usb 2-2: Manufacturer: Linux 3.16.0-qtec-standard+ with net2280
>> [  147.772743] usb-storage 2-2:1.0: USB Mass Storage device detected
>> [  147.773018] usb-storage 2-2:1.0: Quirks match for vid 0525 pid a4a5: 10000
>> [  147.773185] scsi host6: usb-storage 2-2:1.0
>> [  147.773361] usbcore: registered new interface driver usb-storage
>> [  147.788950] usbcore: registered new interface driver uas
>> [  148.772699] scsi 6:0:0:0: Direct-Access     Linux    File-Stor
>> Gadget 0316 PQ: 0 ANSI: 2
>> [  148.773192] sd 6:0:0:0: Attached scsi generic sg2 type 0
>> [  148.774860] sd 6:0:0:0: [sdb] 32768 512-byte logical blocks: (16.7
>> MB/16.0 MiB)
>> [  148.888294] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  148.905202] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  148.905207] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  148.906324] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  148.912639] sd 6:0:0:0: [sdb] Test WP failed, assume Write Enabled
>> [  149.014972] sd 6:0:0:0: [sdb] Write cache: enabled, read cache:
>> enabled, doesn't support DPO or FUA
>> [  149.128640] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  149.145953] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  149.145963] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  149.147525] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  149.268626] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  149.285563] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  149.285573] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  149.286904] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  149.404621] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  149.421397] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  149.421404] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  149.422855] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  149.431667]  sdb: unknown partition table
>> [  149.544713] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  149.561649] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  149.561658] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  149.563021] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  149.680733] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  149.697766] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  149.697774] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  149.699025] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  149.706700] sd 6:0:0:0: [sdb] Write cache: enabled, read cache:
>> enabled, doesn't support DPO or FUA
>> [  149.706712] sd 6:0:0:0: [sdb] Attached SCSI disk
>> [  149.820933] usb 2-2: reset SuperSpeed USB device number 2 using xhci_hcd
>> [  149.837887] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc88
>> [  149.837895] xhci_hcd 0000:0e:00.0: xHCI xhci_drop_endpoint called
>> with disabled ep ffff880036f3cc40
>> [  149.839242] xhci_hcd 0000:0e:00.0: Error: Failed finding new dequeue state
>> [  155.752101] usb 3-1.5.6: reset high-speed USB device number 10 using ehci-pci
>> [  155.866642] cdc_acm 3-1.5.6:1.1: This device cannot do calls on its
>> own. It is not a modem.
>> [  155.866756] cdc_acm 3-1.5.6:1.1: ttyACM0: USB ACM device
>> [  155.867613] usb 3-1.5.6: usbfs: process 1521 (pool) did not claim
>> interface 0 before use
>> [  160.471327] pool[1680]: segfault at fffffffffc0e61c0 ip
>> 00007f570f036200 sp 00007f570639f0d0 error 5 in
>> libc-2.19.so[7f570efee000+19f000]
>>
>> Thanks!
>>
>
> Thanks, I see you already found bug 75521
> https://bugzilla.kernel.org/show_bug.cgi?id=75521
>
> I think this is the same cause.
> Currently I suspect that one halted endpoint is not handled before the entire device is reset.
> After device reset we try to handle the old halted endpoint that has a pointer to a invalid old dequeue state.
>
> I'll see If I can make a patch that clears all pending halted endpoint states (xhci software internal states) when a device is reset.
>
> If I send testpatches to the bug can you try them out on top of 3.17-rc2?
>
> -Mathias



-- 
Ricardo Ribalda
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