Re: ftdi_sio BUG: NULL pointer dereference

[Mike Remski]

On 06/04/2014 12:00 PM, Johan Hovold wrote:
> On Wed, Jun 04, 2014 at 11:41:47AM -0400, Mike Remski wrote:
> > Ok, had a chance to try the cdc-acm;  yes it's the ancient one that is
> > in the base install of CentOS 6.4 (2.6.32-71.29.1 centos patched).  I'm
> > hitting something similar;  I noticed there where a few commits for NULL
> > pointer dereferences in cdc-acm.c.
> >
> > I'll poke into this a bit (yes, I know try a newer kernel, etc) and let
> > you know what I find (or perhaps this looks similar to something already
> > seen?).  This device is the same as the original ftdi crash, 1.2 is the
> > same interface with bNumEndpoints == 0.
> >
> > Jun  4 11:35:20 nicA91A84 kernel: cdc_acm 5-2:1.2: This device cannot do
> > calls on its own. It is not a modem.
> > Jun  4 11:35:20 nicA91A84 kernel: BUG: unable to handle kernel NULL
> > pointer dereference at 00000004
> > Jun  4 11:35:20 nicA91A84 kernel: IP: [<f84f9c9e>]
> > acm_probe+0x44e/0x127c [cdc_acm]
> > Jun  4 11:35:20 nicA91A84 kernel: *pdpt = 00000000354eb001 *pde =
> > 000000007f003067
> > Jun  4 11:35:20 nicA91A84 kernel: Oops: 0000 [#1] SMP
> > Jun  4 11:35:20 nicA91A84 kernel: last sysfs file:
> > /sys/devices/pci0000:00/0000:00:1d.0/usb5/5-2/product
> Yeah, you really need to update your kernel. You'll definitely need at
> least commit 99f347caa456 ("USB: CDC ACM: Fix NULL pointer
> dereference").
>
> No more reports until you've tried a recent kernel, ok? ;)
>
> Johan
Agreed.  But I still have to understand it so I can backport the 
appropriate fixes, no?
I'll be quiet now.

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